Crompton 5W GU10 COB LED Introducing the new Cool White Crompton Dimmable COB (chip on board) GU10 LED. Giving out over 450 lumens in light, 65w in old money, they consume only 5w of power & are designed as a direct retrofit for the in-efficient halogen GU10s. Boasting an A++ energy rating & rated at lasting an incredible 30, 000 hours we guarantee that this is about to become a best seller. This bulb is compatible with trailing edge dimmer switches only.