The Osram Parathom Classic A dimmable LED GLS light bulb emits a warm white light at 1055 lumens and requires a mere 11W to do so, though it produces a light equivalent to that of a 75W halogen/incandescent. Features a ES-E27 Edison screw (27mm) base/cap.This phenomenal efficiency renders it suitable for an array of domestic applications, boasting a considerably improved lifespan of 25,000 hours, reduced warm-up time and lower thermal output. Also known as an A60 light bulb.Please visit the manufacturer\'s website for up-to-date dimmer switch compatibility lists for this Osram LED GLS 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 light bulb? Read our guide What is a GLS Light Bulb.