LED LIGHTING SYSTEM HAVING A REDUCED-POWER USAGE MODE

摘要

An LED Sighting system, with first and second types of LEDs of different efficacies, has a reduced-power usage mode. A control system independently controls first and second control groups of first and second types of LEDs, respectively. The control system has one or more modes including a reduced-power usage mode for decreasing the overall power consumption of the fighting system while maintaining a Sight 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-f?ll power and full power and the second control group is off. The predetermined percentage is 50, The control system decreases the overall power consumption of the fighting 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.