MAINTAINING COLOR CONSISTENCY IN LED LIGHTING DEVICE HAVING DIFFERENT LED TYPES

摘要

A lighting device has a plurality of LEDs connected in series. In the lighting device, a first LED assembly has LEDs of a first type having a first luminous flux output decreasing as a first function of its junction temperature. A second LED assembly has LEDs of a second type having a second luminous flux output decreasing as a second function of its junction temperature different from the first function. At least one of the LEDs of the first type and LEDs of the second type is connected in parallel to a resistor assembly having a temperature-dependent resistance. The temperature dependence of the resistance stabilizes a ratio of the first luminous flux output to the second luminous flux output at different junction temperatures of the first LED assembly and the second LED assembly.