The GLS light bulbs universal shape enables these LED GLS 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 12W 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.A thermal plastic shell encases the light bulbs and dissipates heat away from their components more effectively than existing materials, thereby extending their longevity even further. This results in a range of light bulbs that is reliable, green, elegant and easy to install. These dimmable versions are compatible with both leading and trailing edge dimmers though full, industry-wide compatibility cannot be guaranteed. Features a commonly used ES-E27 Edison screw (27mm) cap/base. Also known as an A65 light bulb.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.