Cut the power by flipping the breaker and then clean the socket. Did I mention that you should cut the power before doing this? When I moved in, mine was not working. Took out the bulb and there was a bunch of dead bug debris and dirt both in the socket and on the bulb electrodes. The bulb couldn't even be screwed in all the way. It is true that it takes a little while for the sensor to switch the bulb on after you block the light, most of them will instantly turn the bulb on for a short while as soon as power is applied, i.e. after the circuit breaker is turned on.
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