This LED GLS light bulb ES-E27 Edison screw (27mm) has the amazing ability to be switched from 827 warm white to 840 cool white with the click of a switch.This enables you to easily set the mood of your space by switching the colour of light emitted by the light bulb between warm white and cool white simply by the double click of a your light switch. Turn your kitchen, living room or home office from either a workplace or relaxing area.This LED light bulb consumes only 10.5 Watts of power but gives out the equivalent amount of light as a 75w incandescent lamp. The lumen output is 1055 and has an average rated life of 15,000 hours.Easily change of color temperature with double click of wall switch.Warm or Cool - the choice is yours?When you first decide to invest in LED lighting one of the main considerations is what kind of colour output is best ? Unlike traditional light bulbs LED light bulbs are capable of emitting different shades of light. Most LED GU10 light bulbs on the market are available to buy in either warm white or cool white colours and it\'s often only when you plug them in that you can really see the difference. The Osram LED Classic A Active & Relax gives you the best of both worlds by letting you easily switch between different colour temperatures.When it comes to choosing the colour output of an led light bulb the choice is all personal preference and use. WIth the range of Osram LED Classic A Active & Relax you have the choice. If you like the warm cosy glow of a traditional light bulb then warm white (2700K) would be the ideal choice, If you want a modern, clean look, or you want a light to help you focus on a task you may prefer the cleaner, brighter feel of cool white (4000K). Also known as an A60 light bulb.240V 10.5W (75W equivalent) LED GLSES-E27 capNo - Not Suitable for Dimming2700K and 4000K Warm White + Cool White colour1055 lumensPlease note these lamps are not to be used with normal dimming switches.