The GLS light bulbs universal shape enables these LED versions to retrofit directly into existing fixtures with minimum effort.They are distinctly more efficient than the incandescent versions they are designed to replace, consuming only 11W of power yet producing light of an equivalent brightness to 75W filament light bulbs. This remarkable efficiency - when considered alongside each light bulbs vastly improved longevity and reliability - can potentially reduce your lighting bill by up to 90% whilst simultaneously reducing carbon emissions.With a frosted finish and thermal plastic casing this LED GLS light bulb dissipates heat more effectively than comparable materials, placing less strain on its components and thus extending its longevity even further. This results in a range of GLS light bulbs that is reliable, green, elegant and easy to install.Please note that these dimmable versions are compatible with both leading and trailing edge dimmers though full, industry-wide compatibility cannot be guaranteed.Dimmable - DuoDim™ Technology compatible with leading and trailing edge dimmers. Recommended for Indoor lighting use only. Features a commonly used ES-E27 Edison screw (27mm) cap/base. Also known as an A60 light bulb.This GLS is a newer product from Crompton Lamps and supercedes their old GLS part codes: 7444, 3934, E70CES.Please visit the manufacturer\'s website for up-to-date dimmer switch compatibility lists for this Crompton Lamps 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.