A value pack of 5 5W SMD LED GU10 spotlight light bulbs from Crompton Lamps are a fantastic product that are both energy and cost efficient.Being 4000K It produces a crisp cool white light that is just as bright as a 50W halogen spotlight. The DuoDim Technology is compatible with both leading and trailing edge dimmers. It has a 15,000 hour life, is suitable for fire rated downlights.Please note that that it is only suitable for indoor use.Dimmable. Suitable for fire rated downlights. For Indoor lighting use only. Compatible with both leading and trailing edge dimmers.This LED GU10 spotlight lamp is traditionally known as a PAR16 with a GU10 2-pin twist and lock (10mm apart) base.This GU10 Spotlight is a newer product from Crompton Lamps and supercedes their old GU10 Spotlight part codes: LGU104CWCOB, 5266.Please visit the manufacturer\'s website for up-to-date dimmer switch compatibility lists for this Crompton Lamps LED GU10 Spotlight light bulb before purchase.To find the answers to some common questions about LED dimming, please read our guide Dimming for Dummies.Need more help in choosing a suitable spotlight bulb? Read our guide What is a GU10 Spotlight Bulb.