This Halogen Medium Bulbs turn on instantly and are fully dimmable, so they can be used with standard dimmer switches. Frequent on-off cycling doesn't shorten the lifetime of halogen light bulbs, so they're suitable for use in fixtures where a compact fluorescent light bulb would burn out prematurely.Product dimensions:1.77" width x 4.37" lengthProduct weight:-Halolux 29506BHalogen Bulbs MediumHL150BT15/CL 220-240V220/240 Volts150 WattsAverage Life Hours: 2,500Shape: BT15Base Type: E27Clear Finish.Usage Tips:Halogen light bulbs are safer for the environment because they contain no mercury.Additional info:Great for displaying colors to advantageGood for task lighting.LTBB-240V150W-BT-E27-CL #05378