At first they just made my bulbs flicker like a party light - the sensor is too sensitive and switches on and off quickly and emits light which turns the bulb off and then spins quickly off and on again a few times. I had to modify them a bit by adding 3 layers of white tape over the sensor to keep them from flickering/flashing. Now they work great but I will have to change the tape from time to time as they are installed outdoors.
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