2.4w LED dusk till dawn sensor GU10 bulb. Colour temperature - 4000k neutral white. As the ambient light drops below 10 lux (dusk), the bulb will automatically switch on. As the ambient reaches 15 lux (dawn), the bulb will automatically switch off. The operation of the sensor will be affected by other sources of light within 1.5m, such as street lighting. The sensor bulbs should not be installed in light fittings positioned within a 1.5m distance of each other as this will affect the operation of the bulbs. The light bulb will only operate in darkness which will conserve the life throughout daylight hours. No more worrying about if you have forgotten to switch the outside light on or off. Start saving instantly on your energy costs. This bulb is the ideal solution to provide truly effective security lighting. ValueLights 2.4w GU10 Dusk til Dawn Sensor Neutral White LED Spotlight Bulb