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Integral Dusk To Dawn Sensor Non-Dimmable 2700K B22 GLS Bulb 4.8W£5.24
This LED daylight bulb from Integral is designed to be a retrofit bulb for your previous 40W incandescent sensor bulb. It is 4.8W so will use a lot less electricity per year. The sensor will switch on automatically at dusk and turns off automatically at dawn and has built in dual sensors to help it detect daylight from all angles.
These bulbs are to be used in suitable IP65 rated enclosed outdoor fittings.