CROSS REFERENCE TO RELATED APPLICATIONS

[0001] The present application claims the benefit of U.S. Provisional Patent Application No. 62/238,158, filed on October 7, 2015, which is incorporated herein by reference in its entirety.

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

[0002] This invention was made with U.S. government support under Grant Number IIP- 1215067 and Grant number IIP- 1350562, awarded by the National Science Foundation. The government has certain rights in this invention.

TECHNICAL FIELD

[0003] The present disclosure relates to wildlife deterrence, and more particularly, to using mono-colored light to induce neurophysical behavioral responses in animals to deter the animals from approaching or intruding a defined area and to a non-lethal wildlife deterrence aircraft lighting apparatus.

BACKGROUND

[0004] Wildlife can prove to be a serious problem in several different ways and wildlife deterrence may be desirable in certain areas for the benefit of the area, the activity within the area, the individuals using the area and/or the wildlife. Wildlife deterrence may be desirable, for example, to keep wildlife from in-flight aircraft. The risk of bird strikes on aircraft is a concern worldwide. Aircraft engines are particularly vulnerable during the takeoff phase when the engine is turning at a very high speed and the plane is at a low altitude where birds are more commonly found. Flocks of birds are particularly dangerous and can lead to multiple strikes. Crashes may even occur when the aircraft is not able to recover in time.

[0005] Developing effective, non-lethal methods for wildlife deterrence, which are also minimally invasive to humans, has been a challenge. Non-lethal methods using frightening noises or sights have been used in controlling transient migratory species, but the effectiveness of these techniques is often short-lived. Animal management methods, such as habitat modification, intended to deprive animals of food, shelter, space and water on or around a protected area, have been the most effective long term tactic. While these techniques that modify the habitat can reduce the risk, these methods are only partially effective and have a limited geographic range. Moreover, combining non-lethal wildlife deterrence with aircraft lighting is particularly challenging given the importance of properly functioning aircraft lights to the safety of the passengers.

SUMMARY

[0006] Consistent with one embodiment, a method includes method includes: defining a deterrence area; determining a species to be deterred within the deterrence area; generating mono-colored light of at least one wavelength within 25 nm of a peak absorption wavelength of a short-wavelength-sensitive (SWS) photoreceptor of the species; and directing the mono-colored light to the deterrence area with a light intensity sufficient to cause a temporary disruption of visual perception in the species to induce an augmented behavioral response resulting in avoidance of the deterrence area.

[0007] Consistent with another embodiment, a method includes method includes: defining a deterrence area; determining a species to be deterred within the deterrence area; generating intermittent pulses of mono-colored light of at least one wavelength within 25 nm of a peak absorption wavelength of a short-wavelength-sensitive (SWS) photoreceptor of the species; and directing the mono-colored light to the deterrence area.

[0008] Consistent with a further embodiment, a method includes: defining a deterrence area; determining a species to be deterred within the deterrence area; generating mono-colored light of at least one wavelength within a sensitivity range of at least one short- wavelength- sensitive (SWS) photoreceptor of the species; and directing the mono-colored light to the deterrence area with a light intensity sufficient to exceed a light adjusted contrast sensitivity function (CSF) intensity threshold for the species when exposed to the mono-colored light within the deterrence area.

[0009] Consistent with yet another embodiment, a system includes at least one light source configured to generate mono-colored light of at least one wavelength within a sensitivity range of at least one short- wavelength- sensitive (SWS) photoreceptor of an avian species to be deterred and to direct the mono-colored light to a deterrence area. The system also includes a controller for controlling the light source to generate the mono-colored light with an intensity of the light within the deterrence area sufficient to exceed a light adjusted contrast sensitivity function (CSF) intensity threshold for the avian species when exposed to the light within the deterrence area.

[0010] Consistent with yet a further embodiment, a system includes at least a first light source configured to generate a first mono-colored light of at least one wavelength within 25 nm of a peak absorption wavelength of at least one short- wavelength- sensitive (SWS) photoreceptor of a first species to be deterred and to direct the mono-colored light to a deterrence area and at least a second light source configured to generate a second mono-colored light of at least one wavelength within 25 nm of a peak absorption wavelength of at least one short-wavelength- sensitive (SWS) photoreceptor of a second species to be deterred and to direct the mono-colored light to the deterrence area. The system also includes a controller for controlling the first and second light sources to generate the first and second mono-colored light.

[0011] Consistent with an embodiment an aircraft lighting apparatus includes a plurality of light emitting diodes (LEDs) configured to generate light and direct the light from an aircraft to a deterrence area in a flight path of the aircraft. At least one of the LEDs is a species deterrent LED configured to emit mono-colored light at a wavelength within a sensitivity range of a short- wavelength-sensitive (SWS) photoreceptor of at least one avian species and with a light intensity in at least a portion of the deterrence area sufficient to cause a temporary disruption of visual perception in the avian specie(s) to induce an augmented behavioral response in the avian species resulting in avoidance of the deterrence area by the avian species. [0012] Consistent with another embodiment, an aircraft lighting apparatus includes a plurality of light emitting diodes (LEDs) configured to generate light and direct the light from an aircraft to a deterrence area in a flight path of the aircraft. The plurality of LEDs include at least one aircraft lighting LED configured to emit white light to perform an aircraft lighting function and at least one species deterrent LED configured to emit light at a wavelength to perform a wildlife deterrence function. The aircraft lighting apparatus also includes at least one LED driver coupled to the LEDs for driving the LEDs and at least one controller coupled to the at least one LED driver and configured to control the aircraft lighting LED(s) and the species deterrent LED(s) independently to perform the aircraft lighting function and the wildlife deterrence function.

[0013] Consistent with a further embodiment, an aircraft lighting apparatus includes a housing defining a light exiting opening, an LED holder located in the housing, and a plurality of light emitting diodes (LEDs) arranged on the LED holder in the housing. The plurality of LEDs include at least one aircraft lighting LED configured to emit white light to perform an aircraft lighting function and at least one species deterrent LED configured to emit light at a wavelength to perform a wildlife deterrence function. The aircraft lighting apparatus also includes a reflector arrangement located in the housing and a protective cover lens covering the light exiting opening and allowing the light to pass through. The reflector arrangement includes a plurality of reflector sections corresponding to the plurality of LEDs and configured to reflect light in a longitudinal direction toward the light exiting opening.

BRIEF DESCRIPTION OF THE DRAWINGS

[0001] These and other features and advantages will be better understood by reading the following detailed description, taken together with the drawings wherein:

[0014] FIG. 1 is a schematic diagram of a wildlife deterrence system using mono-colored light to induce an augmented behavioral response in a species to avoid a deterrence area, consistent with embodiments of the present disclosure.

[0015] FIG. 2 is top perspective view of an embodiment of a wildlife deterrence system for deterring avian species from entering the airspace proximate a runway at an airport. [0016] FIG. 3 is a side view of an embodiment of a wildlife deterrence system for deterring avian species from entering the airspace just above a runway at an airport.

[0017] FIG. 4 is a side view of an embodiment of a wildlife deterrence system for deterring avian species from entering the airspace proximate an aircraft approach and take-off slope proximate a runway at an airport.

[0018] FIG. 5 is a top view of an aircraft including a wildlife deterrence aircraft lighting apparatus, consistent with embodiments of the present disclosure.

[0019] FIG. 6 is a flow chart of a method for wildlife deterrence using mono-colored light to induce an augmented behavioral response in a species, consistent with an embodiment of the present disclosure.

[0020] FIG. 7 is a flow chart of a method for wildlife deterrence using mono-colored light to induce an augmented behavioral response in a species, consistent with another embodiment of the present disclosure.

[0021] FIG. 8 is a flow chart of a method for wildlife deterrence using mono-colored light to induce an augmented behavioral response in a species, consistent with a further embodiment of the present disclosure.

[0022] FIG. 9 is an exploded front perspective view of an embodiment of a wildlife deterrence aircraft lighting apparatus.

[0023] FIG. 10 is an exploded back perspective view of the wildlife deterrence aircraft lighting apparatus shown in FIG. 9.

[0024] FIG. 11 is a front view of the wildlife deterrence aircraft lighting apparatus shown in FIG. 10.

[0025] FIG. 12 is a rear view of the wildlife deterrence aircraft lighting apparatus shown in FIG. 10.

[0026] FIG. 13 is a cross-sectional view of the assembled wildlife deterrence aircraft lighting apparatus taken along line 13-13 in FIG. 12.

[0027] FIG. 13 A is an enlarged view of a section A of the wildlife deterrence aircraft lighting apparatus shown in FIG. 13.

[0028] FIG. 14 is a block diagram of a system for controlling a combined wildlife deterrence and aircraft lighting apparatus, consistent with embodiments of the present disclosure. [0029] FIG. 15 is a flow diagram of a voltage control method for operating a combined wildlife deterrence and aircraft lighting apparatus in response to a monitored voltage, consistent with embodiments of the present disclosure.

[0030] FIG. 16 is a flow diagram of a temperature control method for operating a combined wildlife deterrence and aircraft lighting apparatus in response to a monitored temperature, consistent with embodiments of the present disclosure.

DETAILED DESCRIPTION

[0031] Methods and systems, consistent with embodiments disclosed herein, provide non- lethal wildlife deterrence by using mono-colored light within a sensitivity range of a short- wavelength-sensitive (SWS) photoreceptor of a species to be deterred, such as, for example, an avian species. The mono-colored light may be generated by one or more high brightness mono- colored light emitting diodes (LEDs) and may be within 25 nm of a peak absorption wavelength of the SWS photoreceptor of the species, for example, a violet sensitive (VS) cone and/or an ultraviolet sensitive (UVS) cone of an avian species. The mono-colored light is directed to a deterrence area with an intensity sufficient to cause at least a temporary disruption of visual perception in the species to induce an augmented behavioral response in the species resulting in avoidance of the deterrence area. The light intensity within the deterrence area may exceed a light adjusted contrast sensitivity function (CSF) threshold intensity for the species when exposed to the mono-colored light within the deterrence area. The mono-colored light may also be generated as intermittent pulses having a duration sufficient to keep a pupil of an eye of the species in a continuous unstable state to prevent light adaption by the species.

[0032] An aircraft lighting apparatus, consistent with embodiments described herein, includes at least one species deterrent LED to provide non-lethal deterrence of avian species (i.e., birds) within a deterrence area in an immediate flight path of an aircraft. The species deterrent LED may be configured to emit mono-colored light at a wavelength within a sensitivity range of a short- wavelength- sensitive (SWS) photoreceptor of at least one avian species and with a light intensity in at least a portion of the deterrence area sufficient to cause a temporary disruption of visual perception in the at least one avian species. The disruption of visual perception induces an augmented behavioral response in the avian species resulting in avoidance of the deterrence area by the avian species. A combined wildlife deterrence and aircraft lighting apparatus may include the species deterrent LED(s) together with at least one aircraft lighting LED to provide a concurrent mode of operation. The lighting apparatus may also control the species deterrent LED(s) and aircraft lighting LED(s) independently and may provide voltage control and temperature control to enable the wildlife deterrence function without interfering with the aircraft lighting function. The lighting apparatus may further be configured to reduce luminous flux loss and to provide thermal management to accommodate both wildlife deterrence and aircraft lighting functions.

[0033] Non-lethal wildlife deterrence systems and methods, consistent with the embodiments described herein, relate to the role that the oculo-neuro-motor network plays in the

neurophysiology of animal species and how they perceive and interact with their surrounding environment. More specifically, the wildlife deterrence systems and methods involve the disruption of the oculo-neuro-motor responses through the use of mono-colored light of a sufficient intensity to defeat the normal ability to process the sensor information leading to changes in behavior in a nonlethal manner. The morpho-physiological organization of the visual system is dependent upon the unique characteristics of the eye, the post-receptoral mechanisms of the neuro pathways, and the oculo-neuro-motor mechanisms. Different species (e.g., mammal and avian species) exhibit differences in contrast sensitivity, spatial frequency sensitivity, rod/cone concentration and location, which contribute to behaviors of a particular species within its environment.

[0034] Behavioral responses to visual stimulus involve several steps. The initiation of vision involves the transduction of light striking the eye to create nerve signals as the visual impulse.

Photons striking a photoreceptor with sufficient intensity and appropriate energy (e.g., wavelength) will cause a photochemical reaction creating a nerve impulse that is transmitted to ganglia cells. Signals originating in several photoreceptors pass through a single bipolar cell to a single ganglion cell resulting in synaptic convergence. The ganglia cells are connected to the second cranial nerve (i.e., the optic nerve), which transmits visual information to the vision centers of the brain. In an avian species, the optic nerve is generally larger than the spinal nerve because of the importance of vision to the avian species. Certain mechanisms involved with visual perception may be used to confuse or overwhelm the oculo-neuro network such that the neurophysiological blocking mechanism of the visual system temporarily defeats or disrupts the visual perception of a species, similar to "jamming" mechanisms used to defeat a radar system.

[0035] The ability to visualize objects involves the ability to distinguish contrasts and the ability to perceive colors, which differs among different species. The ability to distinguish contrasts may be measured and represented as contrast sensitivity or the contrast sensitivity function (CSF). Humans and monkeys are capable of accommodating about 120: 1 ratio light contrast, for example, while avian species are capable of accommodating 12: 1 ratio light contrast. As such, the avian species are recognized as having better visual acuity and lower dynamic range compared to humans. The ability to perceive colors involves different types of retinal photoreceptor cells, known as cone cells, which have different but often overlapping absorption spectra or spectral sensitivities. Humans have trichromatic color vision with three distinct types of cones for short (S), medium (M) and long (L) wavelengths; whereas avian species have tetrachromatic color vision with four distinct types of cones including (unlike humans) short-wavelength-sensitive (SWS) cones having sensitivity extending to the ultra-violet (UV) range.

[0036] The perception of color is achieved by a process that starts with the differential output of the cone cells and is finalized in the visual cortex and associative areas of the brain.

According to the opponent-process theory of color vision, color perception is controlled by the activity of two or more opponent photoreceptor systems. In particular, the medium (M) and long (L) wavelength cones often operate in tandem and the UV and short (S) wavelength cones often operate in tandem. The SWS cones (e.g., UV and S) are often a small percentage of the total cones in the retina and are distributed throughout the retina with a non-uniform density. Thus, the contribution of the SWS cones to the neurological signals is often disproportionately higher than the M and L cones. The mechanism of augmented behavioral response invoked by embodiments of the wildlife deterrence systems and methods described herein involve the contribution of the SWS cones to the dynamic range of neurological signals from the ganglia to the brain, which is disproportionately high compared to the number of SWS cones actually present. Thus, the most effective wavelengths for inducing an augmented behavioral response in a species involve the SWS cones of a species.

[0037] The cone-opponent neuro signal processing mechanism is analogous to an electrical circuit design having a limited dynamic range. Exceeding the dynamic range of the circuit results in a saturated signal in which no information can be derived. Similarly, mono-colored light within the sensitivity range of SWS cones of a species and with an intensity exceeding the dynamic range is capable of inducing a saturated neuro signal. Wavelengths closely matched to the SWS cones (e.g., blue or ultraviolet) of the species (i.e., within 25 nm of a peak absorption wavelength) are likely to maximize the effect of the cone-opponent neuro signal processing. A mismatch between the wavelength of the mono-colored light and the peak absorption spectrum of the SWS cones of the species may be compensated by increasing the intensity of the mono- colored light striking the cone.

[0038] Light adaptation decreases the sensitivity of the eye to light sources with a higher luminance than a previous level and may result in a saturated neuro signal coming back into a dynamic range in which perceptual information may be obtained. An augmented behavioral response may still be induced by generating mono-colored light at a sufficient intensity to exceed a light adjusted CSF threshold intensity (e.g., as defined by the brightness of the illumination region of the image of the light adapted eye plus the CSF ratio). Light adaption occurs in a sequence of reactions including behavioral avoidance of bright lights, pupil contraction, depletion of photopigment, and cellular adaptation. Light adaptation may also accompanied by a temporary loss in contrast sensitivity at higher luminance levels. Confusion of the color blending functions of the signals from the photoreceptors results in impaired visual perception. This condition is similar to when humans experience a bright light source such a solar glint or solar glare and has difficulty "seeing." Conversely, if the eye becomes light adapted to the light sources with a higher luminance which is suddenly turned OFF, then a depleted neuro signal is below the dynamic range in which perceptual information may be obtained. This condition is similar to when humans enter a dimly lit room immediately after being exposed to bright sunlight or other bright light source and has difficulty "seeing."

[0039] Thus, intermittent pulses of mono-colored light may keep the eye in a constant unstable state, preventing the eye from adapting. The change in the pupil size modifies a set point of the CSF that the eye accommodates and the repetition of additional series of pulses induces the vision system to attempt to adapt to a constantly changing set of light conditions. When the ocular-neuro network is overwhelmed in this manner, the ability of the species to maintain visual perception is effectively defeated. This overwhelmed neurological condition results in the interference of neurophysiological processes of the vision system and brain controlling edge detection, motion, optical flow, afterimage, illusions and flicker fusion and may also induce neurophysical illusions. Humans generally do not perceive flicker rates greater than 30Hz, whereas some avian species can perceive flicker rates greater than 100Hz.

[0040] Field experiments were conducted with a variety of avian species, namely, Osprey, Red- tailed Hawk and the Common Eiders. The tests involved wild species in their natural environments pursuing their natural food sources. Mono-colored high brightness LEDs were placed in visible location in close proximity to the preferred food sources of the three species. The peak spectral emission LED tested included 365 nm, 385 nm, 395 nm, 405 nm, 435 nm, 455 nm, and 470nm. The 395 nm LED was found to be effective in modifying foraging and nesting behaviors of Osprey and foraging behaviors of Common Eiders. Also, the 455 nm LED was found to be effective in modifying the foraging behaviors of the Red-tailed Hawk. Osprey, Common Eider, and species similar to the Red-tailed Hawk have VS type cones. The difference in behavior of the species was observed when the light was ON and when the light was OFF. With all three species, when the LED was ON, the avian species that approached the food source waited for an extended period of time from a safe distance from the LEDs. As the distance between birds and the mono-colored LEDs decreased, the intensity of behavioral response increased, ranging from subtle changes of flight direction or altitude to complete reversal of flight direction. The safe distance may correlate with the upper limit of the CSF range at which they could observe the food source. If the birds decreased the distance to the LEDs, they exhibited an augmented behavioral response and rarely pursued the food source after such a response.

[0041] As used herein, the term "contrast sensitivity function (CSF)" refers to the inverse of the contrast detection threshold (i.e., the lowest contrast at which a pattern can be seen) as a function of spatial frequency and light intensity and is a measure of the ability of a species to detect contrast (and thus to visualize objects). As used herein, "light adjusted CSF threshold intensity" refers to the light intensity at a limit of the dynamic range of the light adjusted eye of a species above which a saturated neuro signal occurs resulting in a substantial loss of contrast sensitivity. As used herein, "augmented behavioral response" refers to a distinct behavioral action made in response to a non-natural stimulus that overwhelms or confuses the oculo-neuro- motor network.

[0042] As used herein, the term "sensitivity range" refers to a range of wavelengths that may be detected by a photoreceptor and the term "peak absorption wavelength of a short-wavelength- sensitive (SWS) photoreceptor" refers to a wavelength with a peak absorbance within the sensitivity range of wavelengths that can be detected by the SWS photoreceptor of the species. As used herein, the term "mono-colored" refers to light having a relatively narrow bandwidth within 15-20 nanometers (nm) of a spectrum peak and a "mono-colored" LED generates only light within this narrow spectrum. As used herein, the term "high brightness" refers to LEDs that operate with a. high emission power efficiency, greater than 20%. The LEDs may include, for example, LED chips with multiple individual LED die packaged into a single light emitting component requiring from 3 to 100 watts and sometimes more of input power.

[0043] Referring to FIG. 1, a wildlife deterrence system 100 generally includes one or more light sources 110-1 to 110-n generating mono-colored light 111-1 to 111-n and directing the mono-colored light 111-1 to 111-n at a deterrence area 112 to deter a species 113 from entering the deterrence area 112. The deterrence area 112 may be on the ground or in the air and may have various shapes and/or sizes. The deterrence area 112 is an area in which deterrence is desired and does not necessarily require absence of all instances of the species 113 from the area 112. Examples of deterrence areas include areas where the species 113 may cause harm or damage as well as areas that may be harmful to the species 113. The species 113 may include a single species or multiple different species.

[0044] The light sources 110-1 to 110-n may include, for example, high brightness mono- colored LEDs, which have advantages over other light sources including lower energy consumption, longer lifetime, improved physical robustness, smaller size, faster switching rates, and the capability of narrow bandwidth spectral emission. The mono-colored light 111-1 to 111- n is generated at one or more wavelengths that are more likely to induce an augmented behavioral response in one or more species 113 to be deterred from the area 112. The wavelength(s) of the mono-colored light 111-1 to 111-n include wavelengths that are within a sensitivity range of one or more SWS photoreceptors of one or more species to be deterred and may be matched to the SWS cone(s) of the species, i.e., within 25 nm of the peak absorption wavelength. As discussed above, mono-colored light at such wavelengths is capable of sufficiently disrupting the oculo-neuro-motor responses to defeat the normal ability to process sensory information leading to changes in behavior in a non-lethal manner.

[0045] The light sources 110-1 to 110-n may include multiple light sources 110-1 to 110-n of the same wavelength and/or multiple light sources 110-1 to 110-n of different wavelengths associated with deterrence of different species. The system 100 may also include the mono- colored light sources 110-1 to 110-n together with other lights sources, such as white LEDs, providing functions other than deterrence. The wildlife deterrence system 100 may also include other deterrence systems in addition to the light sources 110-1 to 110-n to provide multi-sensory stimuli, which may intensify the behavioral response. Other deterrence systems may include, for example, auditory deterrence systems that produce sounds likely to deter a particular species (e.g., sounds known to frighten a particular species).

[0046] The wildlife deterrence system 100 also includes a controller 114 for driving the light sources 110-1 to 110-n and controlling the generation of the mono-colored light 111-1 to 111-n including parameters such as the light intensity and/or the pulse duration. The mono-colored light 111-1 to 111-n may be directed toward the deterrence area 112 and controlled to provide a light intensity within at least a portion of the deterrence area 112 sufficient to cause a temporary disruption of the visual perception in the species within the area 112 to induce the augmented behavioral response. More specifically, the light intensity within at least a portion of the deterrence area may exceed a light adjusted contrast sensitivity function (CSF) intensity threshold for the species when exposed to the light within the deterrence area 112, as discussed above. The controller 114 may control the light sources 110-1 to 110-n together or individually to provide different light intensities.

[0047] The controller 114 may also control one or more of the light sources 110-1 to 110-n to provide intermittent pulses of light (e.g., at varying pulse durations) to keep a pupil of an eye of the species in a continuous unstable state to prevent light adaptation by the species. The controller 114 may control the light sources 110-1 to 110-n to provide intermittent pulses, for example, by turning the light sources on and off for different durations. The controller 114 may control the light sources 110-1 to 110-n together or individually.

[0048] The controller 114 may include known circuitry, hardware, and/or software for controlling LEDs. A power source 116, such as an external power source or battery power source, may be coupled to or integrated with the controller 114.

[0049] Example embodiments of the wildlife deterrence system 100 are used to deter avian species (i.e., birds) and the deterrence area 113 may include areas where birds may be harmed, such as wind farms, and areas where birds may cause harm, such as crops, aquiculture farms, and airways. For an avian species, the SWS photoreceptor may include an ultraviolet sensitive (UVS) cone with a sensitivity range of 350 - 450 nm and a peak absorption in a range of 360- 373 nm and/or a violet sensitive (VS) cone with a sensitivity range of about 400 - 470 nm and a peak absorption within a range of 402-427 nm. As such, the light sources 110-1 to 110-n may include high brightness UV LEDs, violet LEDs, and/or blue LEDs. The light adjusted CSF intensity threshold of an avian species may thus be exceeded by light (within a sensitivity range of a SWS photoreceptor) having an intensity in the deterrence area greater than 10 ^"6 W/cm ² or greater than 2xl0 ⁶ photons/mm ² . To prevent the eye of the avian species from achieving a light adaptive state, the controller 114 may control one or more of the light sources 110-1 to 110-n to provide intermittent pulses with varying ON pulse durations in a range of 5-1000 ms and varying OFF pulse durations in a range of 20-2000 ms.

[0050] Other embodiments of the wildlife deterrence system 100 may be used for different species (e.g., different avian species and/or other animal species) having different sensitivity ranges and peak absorptions of SWS photoreceptors and different contrast sensitivities. The light sources 110-1 to 110-n may have different wavelengths for the different species such as a first set of LEDs for causing neurophysical behavioral responses for a first species and a second set of LEDs for causing neurophysical behavioral responses for a second species. The controller 114 may also control the intensity and/or pulse duration of the light sources 110-1 to 110-n differently for different species.

[0051] As shown in FIGS. 2-4, embodiments of a wildlife deterrence system 200 may be used to deter avian species from entering the airspace proximate a runway 212 at an airport. In this embodiment, the deterrence area may be the airspace immediately above the runway 212 and/or the airspace along the approach slope and take-off path of an aircraft 215. A plurality of light sources 210, such has mono-colored high brightness LEDs as described above, are located periodically along one or both sides of the runway 212 to illuminate the airspace immediately above the runway 212. One or more light sources 211 may also be located at the end of the runway for illuminating the airspace along the approach slope and take-off path of the aircraft.

[0052] The light sources 210 along the runway 212 may be spaced periodically (e.g., with a spacing of about 100 meters) such that the light emitted from the light sources 210 creates a wall of light forming a linear barrier along the length of the airspace that the aircraft passes through above the runway 212. As shown in FIG. 2, the light sources 210 may be staggered on each side of the runway 212 to provide the linear barrier along the length of the runway 212. As shown in FIG. 3, the light sources 210 along the runway are directed at an angle and generate light capable of providing the desired intensity across the full width of the runway 212. Temporal

synchronization by coordinating the illumination from multiple light sources upon a common airspace may also be used to enhance the illuminated intensity, thereby increasing the effective deterrence at a greater distance from the light sources.

[0053] As shown in FIG. 4, the light sources 211 at the end of the runway illuminate a narrowly focused beacon of light on an angle that corresponds to the airspace along the approach or take-off slope. The light sources 211 may be capable of generating light that provides a desired intensity over a substantial distance of the approach or take-off slope, for example, 1 nautical mile and/or 500 ft. above ground level (AGL), which corresponds to a typical 3 degree approach slope. The light sources 211 may also be configured to cover varying approach or take-off slopes and may include rotating beacons that sweep the light vertically and/or horizontally across the airspace along the approach or take-off slope to deter birds from the airspace surrounding the approach or take-off slope.

[0054] Referring to FIG. 5, a wildlife deterrence aircraft lighting apparatus 500, consistent with embodiments of the present disclosure, is used on an aircraft 515 to deter avian species from entering an airspace 512 in the immediate path of the aircraft 515 during flight. The wildlife deterrence aircraft lighting apparatus 500 may combine the wildlife deterrence function with an aircraft lighting function, such as landing lights and/or taxi lights, in a single apparatus. In other embodiments, the wildlife deterrence aircraft lighting apparatus 500 may be a separate lighting apparatus for wildlife deterrence used together with landing lights and/or taxi lights.

[0055] The wildlife deterrence aircraft lighting apparatus 500 includes light sources located on the aircraft 515 to direct the light (e.g., in the form of a narrowly focused beacon of light) to a deterrence area in the airspace 512 in the immediate path of the aircraft 515. The light sources may be capable of emitting light with a divergence angle to provide the desired intensity across a distance of at least a width of the aircraft 515 and with an intensity capable of inducing an augmented behavioral response before the aircraft 515 reaches the location of the bird.

[0056] In one example, light emitted at 100W with a divergence angle of 10° may provide an intensity of about 4.9 x 10 - ^" 5 W/cm 2 across a diameter of about 20m at a location 512a about 112.5 m in front of the aircraft 515. This should induce an augmented behavioral response in a bird within this area causing the bird to leave the area with enough time (e.g., 1.5 s for an aircraft traveling at 75 m/s) before the aircraft 515 reaches the location. The light will continue to diverge at greater distances from the aircraft 515 with a decreasing intensity. The light emitted at 100W with a divergence angle of 10° may provide an intensity of about 1.1 x 10 ^"6 W/cm ² across a diameter of about 182 m at a location 512b about 125 m in front of the aircraft 515. At these further distances, the intensity of the light may not be sufficient to induce a neurophysical response but may still be sufficient to induce a voluntary or aversion response, such as discomfort, panic, stress or heightened awareness, which may cause some deterrence at these greater distances.

[0057] The wildlife deterrence aircraft lighting apparatus 500 generally includes a plurality of light emitting diodes (LEDs) configured to generate the light and direct the light from the aircraft to the deterrence area in the airspace 512. At least one of the LEDs may be a species deterrent LED that emits mono-colored light at a wavelength within a sensitivity range of a short-wavelength-sensitive (SWS) photoreceptor of at least one avian species, such as a violet sensitive (VS) cone of the avian species and/or an ultraviolet sensitive (UVS) cone of the avian species. The species deterrent LED(s) also emit the mono-colored light with a light intensity in at least a portion of the deterrence area sufficient to cause a temporary disruption of visual perception in the at least one avian species. The temporary disruption of visual perception should induce an augmented behavioral response in the avian species resulting in avoidance of the deterrence area by the avian species.

[0058] In particular, the species deterrent LED may include one or more blue LEDs emitting blue light with a bandwidth of less than +/-15 nm and a peak spectrum emission between 400 nm and 470 nm, one or more near UV LEDs emitting near UV light with a bandwidth of less than +/-15 nm and a peak spectrum emission between 380 nm and 400 nm, and one or more UV LEDs emitting UV light with a band width of less than +/-15 nm and a peak spectrum emission between 355 nm and 380 nm.

[0059] The aircraft lighting apparatus 500 may also include one or more aircraft lighting LEDs configured to emit white light for providing the aircraft lighting. The white light may have a color temperature in a range of 3000 to 5500 degrees Kelvin. In this embodiment, the aircraft lighting apparatus 500 may control the species deterrent LED(s) and the aircraft lighting LED(s) independently to provide both the non-lethal wildlife deterrence function and the aircraft lighting function simultaneously. The aircraft lighting apparatus 500 may also provide voltage control and temperature control to enable both functions (i.e., primarily the aircraft lighting function and secondarily the wildlife deterrence function) within voltage and temperature constraints, as will be described in greater detail below. The aircraft lighting apparatus 500 may also be designed and configured to minimize or reduce loss of luminous flux and to provide thermal management to enable both functions simultaneously, as will be described in greater detail below.

[0060] Referring to FIGS. 6-8, various methods of wildlife deterrence are illustrated and described. It will be appreciated by those of ordinary skill in the art that unless otherwise indicated herein, the particular sequence of steps described is illustrative only and can be varied without departing from the spirit of the invention. Thus, unless otherwise stated the steps described below are unordered meaning that, when possible, the steps can be performed in any convenient or desirable order.

[0061] According to one method 600, shown in FIG. 6, a deterrence area is defined 610 and a species to be deterred within the area is determined 612. As described above, for example, the area may be defined relative to an airport runway and/or aircraft and the species may be determined to be the avian species common to that geographical location and area. In other examples, the deterrence area may be defined as other locations that might be harmed by a species, such as crops or aquaculture farms, or that might cause harm to a species, such as wind farms.

[0062] The method 600 also includes generating 614 mono-colored light of at least one wavelength within 25 nm of a peak absorption wavelength of a SWS photoreceptor (i.e., an SWS cone) of the species. For an avian species, for example, the mono-colored light may generated within 25 nm of a peak absorption wavelength of a UVS cone and/or VS cone of the species, as discussed above. The mono-colored light may be generated by one or more mono-colored high brightness LEDs, for example, such as a blue LED, violet LED and/or UV LED depending upon the species to be deterred.

[0063] The method 600 further includes directing 616 the mono-colored light to the deterrence area with a light intensity sufficient to cause a temporary disruption of visual perception in the species to induce an augmented behavioral response resulting in avoidance of the deterrence area by the species. For an avian species, for example, the light intensity may be greater than 10 ^"6 W/cm ² or greater than 2xl0 ⁶ photons/mm ² . Directing the light may include angling the light, focusing the light, diverging the light, reflecting the light and/or moving the light to provide a desired light intensity across a distance covering at least a portion of the deterrence area. The light does not necessarily need to cover the entire deterrence area at the desired intensity.

[0064] According to another method 700, shown in FIG. 7, a deterrence area is defined 710, a species to be deterred within the area is determined 712, and intermittent pulses of mono- colored light of at least one wavelength within 25 nm of a peak absorption wavelength of at least one SWS photoreceptor of the species are generated 714. For an avian species, for example, the intermittent pulses may be generated with a varying pulse duration in a range of 5 - 1000 ms or in a range of 20 - 2000 ms to keep a pupil of an eye of the avian species in a continuous unstable state to prevent light adaptation. The mono-colored light is directed 716 to the deterrence area.

[0065] According to a further method 800, shown in FIG. 8, a deterrence area is defined 810, a species to be deterred within the area is determined 812, and mono-colored light of at least one wavelength within a sensitivity range of at least one SWS photoreceptor of the species is generated 814. The mono-colored light is directed 816 to the deterrence area with a light intensity sufficient to exceed a light adjusted contrast sensitivity function (CSF) intensity threshold for the species when exposed to the mono-colored light within the deterrence area. For an avian species, for example, the light intensity may be greater than 10 ^~6 W/cm ² or greater than 2xl0 ⁶ photons/mm ² to exceed the light adjusted CSF intensity threshold.

[0066] Referring to FIGS. 9- 13 A, an embodiment of a wildlife deterrence aircraft lighting apparatus 900 providing both wildlife deterrence and aircraft lighting is shown and described in greater detail. The aircraft lighting apparatus 900 may be used, for example, as a landing light and/or taxi light on an airplane. As shown in FIGS. 9 and 10, this embodiment of the aircraft lighting apparatus 900 generally includes a housing 910, an LED holder 920 holding a plurality of LEDs 922a-d, a reflector arrangement 930, and a protective cover 940. When assembled, the LED holder 920 is located inside the housing 910 with the reflector arrangement 930 positioned over the LED holder 920 and the protective cover 940 positioned over a light exiting opening 912.

[0067] The LEDs 922a-d include one or more species deterrent LEDs 922a-c for providing non-lethal wildlife deterrence together with one or more aircraft lighting LEDs 922d for providing aircraft lighting such as landing lights and/or taxi lights. The species deterrent LEDs

922a-c may emit mono-colored light at a wavelength and intensity to perform the wildlife deterrence function, for example, as described above. The aircraft lighting LEDs 922d may emit white light for aircraft lighting. Multiple LEDs 922a-c may be used to provide the desired luminous flux for the aircraft lighting and wildlife deterrence functions. This embodiment of the aircraft lighting apparatus 900 thus provides both a non-lethal wildlife deterrence function and an aircraft lighting function in a single housing. As will be described in greater detail below, the aircraft lighting apparatus 900 may be designed and configured to provide both of these functions most effectively by reducing luminous flux loss and providing thermal management.

[0068] A back side of the housing 910 includes a mechanical interface for mounting the lighting apparatus 900 to an aircraft and an electrical interface for electrically connecting the lighting apparatus 900 to an aircraft power line, as will be described in greater detail below. The outside diameter of the housing 910 may conform to industry standard dimensions such that a metal clamping ring (not shown) may press against and hold the lighting apparatus 900 within a light receiving housing (not shown) on the aircraft. The housing 910 also includes a cooling body 914 including, for example, louver fins disposed along a back side thereof. The housing 910 and components thereof (e.g., louver fins) may be cast from aluminum. A cooling fan (not shown) may be positioned within the louvers location to assist in providing airflow through the louvers to increase the rate of thermal transfer away from the louvers. The design of the housing 910 is substantially circular and cylindrical, although also other forms for the housing 910 can be used.

[0069] A front side of the housing 910 is configured to be secured to the protective cover 940. The example embodiment of the housing 910 includes an edge ring 916 around the edge of the light exiting opening 912 for mating with a frame 942 of the protective cover 940 to secure the protective cover 940 to the housing 910 and provide an environmental seal to the interior airspace of the landing light. As shown in greater detail in FIGS. 13 and 13 A, the edge ring 916 of the housing 910 includes ridges 917 that mate with the cover frame 942, and fasteners 918 (e.g., screws) secure the housing 910 to the cover frame 942. The protective cover 940 may be fabricated from molded polycarbonate or similar material that allows light to pass through.

[0070] As shown in FIGS. 11 and 12, the housing 910 and the cover frame 942 include one or more air slots 917, 917a around a perimeter to allow air flow between the forward facing side (FIG. 11) and the backward facing side (FIG. 12). The air may thus flow across the cooling body 914 to enhance the transfer of waste heat from the lighting apparatus. The protective cover 940 also includes one or more depressions 944 on a front surface corresponding to the larger air slots 917a to laminar flow and aid in providing airflow to the larger air slots 917a. Although one configuration of air slots and depressions is shown, other configurations (e.g., different sizes, numbers and shapes) are within the scope of the present disclosure.

[0071] As shown in greater detail in FIGS. 12 and 13, power terminals 950 extend through the housing 910 to make an electrical connection between the aircraft power supply and the electronic components located inside the interior space of the housing 912. The power terminals

950 may be made of a non-corrosive electrically conductive material. A non-electrically conductive material 952, 954 (e.g., a potting material) surrounds each of the power terminals 950 to provide electrical and environmental isolation. As shown in FIG. 13, a first portion 952 of non-electrically conductive material surrounds the base of the power terminal 950 to provide electrical isolation where the power terminal 950 passes through the housing 910 and a second portion 954 of non-electrically conductive material environmentally seals the housing 910 while providing electrical isolation between the power terminal 950 and the housing 910.

[0072] An air vent 956 also passes through the housing 910 into the interior airspace 913 within the housing 910 to allow for equalization of pressure inside the interior airspace with the exterior air pressure. A moisture barrier material 958 surrounds and protects the air vent to prevent moisture from entering while allowing pressure equalization.

[0073] The LED holder 920 and the reflector arrangement 930 both have a generally round shape and are sized to fit inside and mate with the housing 910 with the reflector arrangement 930 positioned over the LED holder 920. The LED holder 920 includes a substrate material 921 on which the LEDs 922a-d are mounted. As shown in FIGS. 13 and 13 A, the substrate material 921 is located against an inside surface 911 of the housing 910 and a thermally conductive material 923, such as a thermally conductive pad or gel, may be used between the substrate material 921 and the inside surface 911 of the housing 910 to enhance thermal conduction. The air vent 956 also passes through the substrate material 921 and the thermally conductive material 923 into the interior airspace 913.

[0074] The LEDs 922a-d may include individual LED chips or groupings of LED chips mounted to the substrate material 921 of the LED holder 920. The reflector arrangement 930 includes reflector sections 932 corresponding to the individual LED chips or groupings of LED chips to reflect the light emitted from the LEDs 922a-d in a direction toward the light exiting opening 912 as shown by arrows 2 in FIG. 13A. In some embodiments, groupings of LED chips corresponding to each reflector section 932 may include LED chips emitting the same wavelengths (e.g., all white LEDs, all blue LEDs, all near UV LEDs or all UV LEDs) or may include a mixture of different LEDs (e.g., white LEDs with different species deterrent LEDs or different species deterrent LEDs). The LED chips may be grouped and arranged on the LED holder 920 in a manner that avoids thermal hotspots.

[0075] The reflector sections 932 may include curved (e.g., parabolic) reflectors or total internal reflection (TIR) lenses/optics to collect and direct the light in the same general direction substantially parallel to a longitudinal axis of the apparatus 900. Additionally or alternatively, other optics may also be used including, without limitation, an aspheric lens. The reflector sections 932 and other optics may direct and focus the light to minimize or reduce luminous flux loss. In particular, the reflector sections 932 and other optics provide a relative large focal length and relatively small beam angle to achieve a sufficiently high intensity at the peak for both the aircraft lighting and wildlife deterrence functions.

[0076] The optical emission pattern may conform to the Aerospace Recommended Practice ARP693 Rev D. and ARP5825A requirements. These requirements include landing light design objective of 21.5 lux (2 ft-c) minimum at 122m (400 ft) in front of the pilot at touch down attitude when measured normal to the light beam, and a taxi light design objective of 5.4 lux (0.5 ft-c) minimum at 91 m (300 ft) in front of the pilot during ground roll when measured normal to the light beam. The minimum illumination (typically 50% peak power) may be maintained to 10 feet outboard of the most extreme wingtip structure of the aircraft at 91 m (300 ft).

[0077] In addition to supporting the LEDs 922a-d, the LED holder 920 may support one or more LED drivers for driving the LEDs 922a-d and one or more controllers for controlling the LED drivers 924 and the operation of the LEDs 922a-d. The LED driver(s) may include known LED driver circuits and may power either an individual LED or multiple LEDs. The controller may control the pulse width modulation of the LEDs 922a-d by controlling the ON/OFF state of the LED driver(s) and the pulse rate of the LEDs 922a-d. The LED holder 920 may also support a thermistor to monitor the temperature of the LEDs 922a-d and a voltage monitor to monitor voltage. The controller may adjust the pulse rate of the LEDs 922a-d in response to the monitored voltage and the monitored temperature to reduce the duty cycle of the LEDs 922a-d to maintain the voltage in a range sufficient for powering at least the aircraft lighting LEDs 922d and to maintain the temperature below a maximum operating temperature of the LEDs, as will be described in greater detail below. The controller may include logic control circuitry known to those skilled in the art for controlling LEDs.

[0078] In an embodiment, the species deterrent LEDs 922a-c include a combination of one or more blue LEDs 922a, near UV LEDs 922b, and UV LEDs 922c and the aircraft lighting LEDs

930d include white light LEDs producing white light for the aircraft lighting function (e.g., landing and/or taxi lights). The blue colored LEDs 930a may be pulsed at a rate in a range of 50

Hz to 100Hz, which is imperceptible to humans while providing deterrence for some avian species. The near UV LEDs 922b and UV LEDs 922c correspond to VS and UVS cone peak spectral sensitivity of avian species and may be pulsed at a rate in a range of 1 Hz to 10 Hz. Accordingly, the light being reflected by the respective reflector sections 932 through the light exiting opening 912 includes multiple colors of light being independently pulsed in different regions.

[0079] Referring now to FIG. 14, an embodiment of a control system for a combined wildlife deterrence and aircraft lighting apparatus 1400 is shown and described in greater detail. The lighting apparatus 1400 and the control system may be powered from a single aircraft power line 1404. The lighting apparatus 1400 may be divided into multiple segments, such as a landing light segment 1406a and taxi light segment 1406b that are controlled by separate aircraft power circuits 1408a, 1408b. Each of the segments 1406a, 1406b include a DC power supply 1409a, 1409b and one or more LED strings 1420.

[0080] Each LED string 1420 includes one or more LEDs 1422 (e.g., LED dies) and an LED driver 1424. The LEDs 1422 may be connected in series or parallel and matched to the voltage provided by the DC power supply 1409a, 1409b. The LED drivers 1424 may include LED driver circuits known for driving a string of LEDs. Each LED driver 1424 may have additional resistor and capacitor components such that feedback to the LED driver 1424 from the respective LED string 1420 enables control of the amperage provided to the LED string 1420. Each LED string 1420 may have additional Zener diode components to provide protection to the LED string 1420 by providing a more uniform power load to the resistor and capacitor components, which provides feedback to the LED driver 1424 in the event of a failure of one or more LEDs 1422 in the LED string 1420.

[0081] The LED strings 1420 may include LEDs 1422 capable of emitting different bandwidth and peak spectrum wavelength of light ranging between 680 nm and 350 nm, for example, as discussed above. Each LED string 1420 may include LEDs of a common

type/function (e.g., aircraft lighting LEDs and species deterrent LEDs) to allow the LEDs of the same type to be controlled together and independently of other types of LEDs. In one example, one LED string may include aircraft lighting LEDs (e.g., white light LEDs) and another LED string may include species deterrent LEDs (e.g., mono-colored LEDs of at least one wavelength).

In a further example, one LED string may include aircraft lighting LEDs emitting white light, one LED string may include species deterrent LEDs emitting blue light, one LED string may include species deterrent LEDs emitting near UV light, and one LED string may include species deterrent LEDs emitting UV light. Various other combinations of LED strings with LEDs of different wavelengths are within the scope of the present disclosure.

[0082] The control system further includes a logic controller 1460 electrically connected to each of the LED strings 1420 for controlling the operation of the LED strings 1420

independently. The logic controller 1440 is coupled to the LED drivers 1424 with control inputs 1462 and electrical return lines 1464 and includes one or more electronic components providing a pulse width modulation function. The control system may also include a thermistor 1466 for monitoring temperature within the lighting apparatus and a voltage monitor 1468 for monitoring a voltage delivered to the LED strings 1420. The logic controller 1460 may be coupled to the thermistor 1466 and the voltage monitor 1468 to enable A/D input for voltage monitoring and temperature control. The logic controller 1460 may include circuitry, hardware, software and/or firmware known for use in controlling LED strings and may operate at a frequency of at least 10 Hz and preferably at a frequency greater than 1000 Hz.

[0083] The switching ON/OFF of each LED driver 1424 occurs when it receives a pulse width modulation signal over a control input 1462 from the logic controller 1460 resulting in the electrical connection to one or more LEDs 1422 in that LED string 1420 being energized. The logic controller 1460 may control the pulse width modulation, for example, according to illumination requirements of the flight crew, the avian species to be deterred, the maximum allowable thermal temperature of the LEDs and other electronic components, and/or the failure of the aircraft power supply to meet the DC voltage requirements of the LEDs and other electronic components. The logic controller 1460 may control the pulse width modulation of different LED strings 1420 differently. An LED string with aircraft lighting LEDs may be pulsed differently, for example, than an LED string with species deterrent LEDs. The logic controller 1460 may also control the pulse width modulation to provide a thermal over temperature protection function while also performing primarily the aircraft lighting function and secondarily the wildlife deterrence function, as described in greater detail below. In general, the thermal over temperature protection function involves controlling the LEDs in response to a monitored temperature to maintain a temperature of the LEDs below a maximum allowable operating temperature. [0084] The control system may also include redundant logic controllers (e.g., one in each of the segments 1406a, 1406b) to facilitate independent operation of the landing light segment 1406a and the taxi light segment 1406b. The separate aircraft power circuits 1408a, 1408b may provide either AC or DC voltage to energize the DC power supplies 1409a, 1409b that provide voltage and amperage matched to the circuitry requirements of the logic controller 1460 (or redundant logic controllers) and the LED strings 1420. In one example, when separate aircraft power circuits 1408a, 1408b are utilized, the taxi light segment 1406a is energized whenever the landing light segment 1406b is energized.

[0085] Referring now to FIGS. 15 and 16, example methods for controlling a combined non- lethal wildlife deterrence and aircraft lighting apparatus are shown and described in greater detail. In these example methods, the species deterrent LEDs in the lighting apparatus being controlled include blue LEDs, near UV (UV1) LEDs and UV (UV2) LEDs. In general, the voltage control method 1500 shown in FIG. 15 controls the LEDs to maintain a sufficient operating voltage delivered to the LEDs and electronic components (e.g., primarily to the white aircraft lighting LEDs and secondarily to the species deterrent LEDs). The temperature control method 900 shown in FIG. 9 controls the LEDs such that a temperature proximate the LEDs is maintained below a maximum allowable operating temperature for the LEDs and electronic components. Both methods may be performed together using the logic controller 1460 in the system shown in FIG. 14.

[0086] The example voltage control method 1500 determines 1510, 1514, 1518 if the monitored voltage is greater than a series of set points and controls the species deterrent LEDs accordingly, for example, by reducing 1512, 1516 the pulse rate of one or more types of species deterrent LEDs and/or disabling 1520 one or more types of species deterrent LEDs as needed. If the monitored voltage is determined 1510 to be higher than a first set point (i.e., the highest voltage set point), sufficient voltage is being supplied and the controller may proceed with the temperature control method 900. If the monitored voltage is not greater than the first set point, the allowed pulse rate is reduced 1512 for at least some of the species deterrent LEDs (e.g., by

50% for the UV1 and UV2 LEDs). The method 1500 may then determine 1514, 1518 if the monitored voltage is greater than lower set points (e.g., set point #2 and set point #3) and reduce

1516 the pulse rate and/or disable 1520 LEDs further as needed. In this example, the allowed pulse rate is reduced 1516 for additional species deterrent LEDs (e.g., by 50% for the blue LEDs) if the monitored voltage is not greater than a second set point, and the UV1, UV2 and blue LEDs are disabled 1520 if the monitored voltage is not greater than a third set point.

[0087] As such, the voltage control method 1500 gradually reduces the pulse rate and/or disables species deterrent LEDs until the voltage is sufficient, thereby enabling the maximum possible output within the voltage constraints. Other variations of the voltage control method 1500 are within the scope of the present disclosure. The voltage control method may use, for example, fewer or greater set points and may reduce the pulse rates by different amounts and/or disable only certain types of LEDs.

[0088] The example temperature control method 1600 determines 1610, 1620, 1630, 1640, 1650, 1660 if a monitored temperature is less than a series of set points and controls the LEDs accordingly, for example, by reducing the pulse rates of one or more types of LEDs and/or disabling one or more types of LEDs. All of the LEDs may be enabled 100%, for example, if the monitored temperature is determined 1610 to be less than a first set point (i.e., the lowest temperature set point). If the monitored temperature is not below the first set point, the method 1600 determines 1620, 1630, 1640, 1650, 1660 if the monitored temperature is below additional higher set points and reduces the pulse rate and/or disables one or more types of the species deterrent LEDs accordingly. If the monitored temperature is determined 1620 to be less than a second set point, for example, the pulse rate is reduced for the UV1 and UV2 LEDs (e.g., enabled at 50% of the allowed pulse rate) but not reduced for the white LEDs and the blue LEDs. If the monitored temperature is not less than the second set point but is determined 1630 to be less than a third set point, the pulse rate is further reduced for the UV1 and UV2 LEDs (e.g., enabled at <50% of the allowed pulse rate) and reduced for the blue LEDs (e.g., enabled at <100% allowed pulse rate) but not reduced for the white LEDs. If the monitored temperature is not less than the third set point, the method 1600 may continue to compare the monitored temperature to additional higher set points (n, n+m, n+m+p) and further reduce the pulse rate and/or disable LEDs as needed. The example method 1600 reduces the pulse rate and disables LEDs according to a priority, for example, the UV1 and UV2 LEDs are reduced and disabled first and then the blue LEDs. The white LEDs may be enabled at less than 100% after the species deterrent LEDs have been disabled but may remain ON to provide aircraft lighting functions.

[0089] As such, the temperature control method 1600 reduces the pulse rate and/or disables LEDs only as needed depending upon the monitored temperature, thereby enabling the maximum possible output within the temperature constraints. Other variations of the

temperature control method 1600 are within the scope of the present disclosure. The temperature control method may use, for example, fewer or greater set points and may reduce the pulse rates by different amounts and/or disable the LEDs differently.

[0090] Accordingly, a wildlife deterrence lighting apparatus, consistent with embodiments of the present disclosure, provides effective, non-lethal wildlife deterrence on an aircraft.

Embodiments of the wildlife deterrence lighting apparatus effectively combine the non-lethal wildlife deterrence function with aircraft lighting functions within the voltage and temperature constraints of the lighting apparatus.

[0091] Throughout the entirety of the present disclosure, use of the articles "a" or "an" to modify a noun may be understood to be used for convenience and to include one, or more than one of the modified noun, unless otherwise specifically stated.

[0092] While the principles of the invention have been described herein, it is to be understood by those skilled in the art that this description is made only by way of example and not as a limitation as to the scope of the invention. Other embodiments are contemplated within the scope of the present invention in addition to the exemplary embodiments shown and described herein.

Modifications and substitutions by one of ordinary skill in the art are considered to be within the scope of the present invention, which is not to be limited except by the following claims.