Harvard CoolLED LED Driver provide a high-performance solution for powering high-brightness LEDs from a mains supply. It has an ability to control individual LED luminaries and simultaneous control of all or specified groups. High Efficiency and Long-Life design ensure cool operation and long life with extra benefit of a very low off power. Isolated DALI interface. Constant current output. Self-resetting thermal trip. Double insulated, electrical efficiency class II. Up to 88% efficiency. LED string fault reporting. Isolated DALI interface. Lamp fault reporting checks on LED string volts.