This coated 400W Elliptical Metal Halide HID light bulb is excellent for producing large levels of crisp bright white light. Able to operate off of both mercury and SON control gear, these light bulbs are the easy, confusion-free way to replace your old light bulbs. Fitted with a GES-E40 Goliath Edison screw (40mm) cap (sometimes known as a giant screw cap).With a rated life of 20,000 hours, these elliptical metal halide light bulbs give less glare and are perfect for industrial applications.This light bulb contains glass with a special coating to filter out all harmful UV rays - this removes the need for the light bulb to be installed in a fitting with additional UV protection.Perfect for applications such as outdoor lighting of squares, parks, roads and car parks. This light bulb is designed to run on mercury control gear and can be used in any burning position.This metal halide is designed for use in closed fittings only.