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By certification 
1 leading edge, For built-in driver LEDs, incandescent lamp, 230V halogen lamps, Conventional transformers and other lamps suitable leading edge dimmer
2 trailing edge For external diver LEDs or , incandescent lamp, 230V halogen lamps, Electronic halogen transformer with 12 V halogen lamps and other lamps suitable trailing edge dimmer
2 trailing edge For external diver LEDs or , incandescent lamp, 230V halogen lamps, Electronic halogen transformer with 12 V halogen lamps and other lamps suitable trailing edge dimmer
