These Energizer LED GLS Bulbs offering an 85% energy saving versus normal bulb. The bulbs are a true retrofit design, provide instant, flicker-free light and have an average rated life of 15,000 hours. This Energizer LED GLS Spotlight Bulb has the following specification: Fitting: GU10 Input Wattage: 4.2W (50 W equivalent) Lumens of Light: 345lm Colour Temperature: 6500K (Daylight) Lamp Dimensions: 54 X 50 X 50 mm Dimmable: Non-Dimmable Rated: F Switching Cycles: 40,000 Average Rated Life: 15,000 hours