To provide a system and a method for retrofitting one or more light emitting diode light sources to a fluorescent lighting device.

A fluorescent lamp fixture 104 includes: a frame; an existing ballast 114 capable of being connected to an AC power source; and at least one LED light source 120 having a connector capable of being connected to an output of the ballast 114. An LED retrofit system includes at least one pin 122 capable of being connected to the connector to receive a high voltage AC signal from the existing ballast 114. The LED retrofit system includes: at least one LED light source 120; a transformer circuit 116 receiving the high voltage AC signal from the existing ballast 114 to convert to a low voltage AC signal; a rectifier circuit 118 receiving the low voltage AC signal to generate a DC voltage for driving the LED light source 120; the at least one pin 122 electrically connecting the transformer circuit 116 to the existing ballast 114; and means allowing the LED retrofit system to be detachably connected to the fluorescent lamp fixture 104.