The Luceco MR16 energy efficient light bulb is available non-dimmable only it produces instant light over a 38 degree angle and it's also available in a 3 colours from warm to cool, is Mercury free and has an expected on/off life cycle of 15,000. Built from high quality components the product represents 90% savings in energy cost compared with a traditional bulb. The measurements of the bulb are 53mm high from the bulb face to the tip of the connection and 50mm across on the bulb face. It operates at a 12AC DC at 50/60 Hz. The product is covered by a 3 year guarantee, just get in touch with us if you have any problems.