SleekLighting GU10 LED, 5 Watt, Dimmable,550 lm, Light Bulb Spotlight, Recessed, Track Lighting. Ac 120v UL Listed (Pack of 4) 4 pack of 5 Watt GU10 LED Energy Saving Bulb Light output of 550 Lumens, Warm White 3000K, Dimmable UL Listed---2 3/8" Easy Installation. Easily fits instead of ordinary GU10 halogen bulbs 3 year NO-HASSLE FREE-REPLACEMENT GUARANTEE