Title:
照明装置
Document Type and Number:
Japanese Patent JP4376464
Kind Code:
B2
Abstract:
As a white light source, the lighting system (1) has at least three light-emitting diodes (6, 7, 8) for providing visible light at preselected wavelengths. The invention is characterized in that the lighting system (1) is provided with at least one fourth light-emitting diode (9) which, in operation, emits visible light in a further wavelength region, the maximum of the spectral emission of the fourth light-emitting diode (9) lying in the further wavelength region from 575 to 605 nm. Preferably, the further wavelength region ranges from 585 to 600 nm. Preferably, the color rendition of the lighting system (1) is above 60. Preferably, the luminous efficacy of the lighting system (1) is above 30 lm/W, preferably above 40 lm/W. In another preferred embodiment, the color temperature of the lighting system (1) can be adjusted by selectively switching the light-emitting diodes (6, 7, 8, 9).
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Inventors:
Herbert F Bernell
Wolfgang Busselt
Thomas Ustel
Hans Nicole
Cornelis El Ronda
Wolfgang Busselt
Thomas Ustel
Hans Nicole
Cornelis El Ronda
Application Number:
JP2000572611A
Publication Date:
December 02, 2009
Filing Date:
September 08, 1999
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
F21S8/04; F21K9/233; F21K9/62; F21K99/00; F21S2/00; F21S10/00; F21V7/22; F21V13/02; H01L25/075; H01L25/13; H01L33/00; H01L33/60; F21W121/00; F21Y113/13; F21Y115/10
Domestic Patent References:
| JP10209504A | ||||
| JP10091083A | ||||
| JP7248549A | ||||
| JP9016106A | ||||
| JP11177143A |
Attorney, Agent or Firm:
Susumu Tsugaru
Kosaku Sugimura
Kosaku Sugimura