Not certain it is RFI because if the lighting circuit is turned off, its probably something to do with an inductor coil or some other silly thing in the lamp(s) being used. I know my garage door opener says to only use an incandescent. Since it is a vibration prone environment with short cycles, a CFL didn't make sense and it is only on 5 minutes at a time for two or three times a day so I just left mine incandescent but when one bulb burned out I didn't bother changing it because one is enough to get me inside the house. An LED is too expensive IMHO for the application that would use only 1/3 kwh per month with the way it is now, not really worth the price, especially if the vibration or heat and humidity in the garage cause an early failure on an LED.
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