I've just moved into a new place, and the hood fan in the kitchen takes Par 20 bulbs. I had some left over LED Par 20s from my last place, so when one burned out, I installed it, and then I replaced the other one with an LED while I was at it.
Once I did that, the light would no longer turn off. There are three brightness settings on the switch, but when I turn it off, it just gets slightly dimmer.
I suppose I could just put back the regular Par 20 bulb, but I'd prefer to save the 56 watts if I can. Any ideas on how to resolve this?
Best Answer
Because somewhere in your system is a powered switch that relies on leaking small amounts of current through the (incandescent) light bulb. When they are not lit, incandescent bulbs are effectively dead shorts. LEDs are not. The small amount of current being leaked is too little to glow an incandescent. However it's plenty enough to glow an LED.
This posting talks about the problem, and one solution, and links to a "gory details" discussion.