If AC mains power is not available (Decision 3804), then the method 3800 has two states that can be entered: (1) the one or more LEDs can be driven at full power (i.e., whatever power is being dictated by a dimmer setting) entirely from energy stored in the energy storage device (Block 3814); or (2) the one or more LEDs can be driven at less than full power, but more than 0 power, entirely from energy stored in the energy storage device (Block 3816).
FIG. 39 illustrates a method of controlling the LED driver systems herein disclosed when a demand response signal is received. The method 3900 can begin with monitoring a wireless network interface (e.g., 1620a or 1620b) for instructions to reduce power consumption or an indication that electrical prices have changed or will change (Block 3902). If any are received (Decision 3904), then, based on the instruction or indication received, the method 3900 can reduce (Block 3906) or cut off (Block 3908) use of AC mains power. To make up for the decreased AC mains draw, the method 3900 can begin drawing from an energy storage device to drive the one or more LEDs (Block 3910). At the same time, the total current driving the one or more LEDs, or the number of LEDs being driven, can optionally be reduced (Block 3912).
