Patent ID: 8283874
Filing Date: 2012-10-09
Classification: H05B

Abstract:
1. An LED lighting system having a reduced-power usage mode, comprising: a) first and second types of LEDs collectively mounted on a lighting fixture; the second type of LED having a substantially higher efficacy than the first type of LED by at least about 10 percent; b) at least 70 percent of the first type of LED being controllable together in a first control group of LEDs by a control system; c) at least 70 percent of the second type of LED being controllable together in a second control group of LEDs by said control system; d) said control system independently controlling only the first and second control groups of LEDs in said lighting fixture; said control system having one or more modes including a reduced-power usage mode for decreasing the overall power consumption of the lighting system while maintaining a light level of at least a predetermined percentage of the level present when the first control group of LEDs operates at a power level between less-than-full power and full power and the second control group is off, said predetermined percentage being 50; and e) the control system decreasing the overall power consumption of the lighting system in the reduced-power usage mode by turning off or dimming the first control group and turning on the second control group to at least some extent.