150W HQI Metal Halide Socket, 1 Pair. * Fits 150W HQI lamp * Spring Loaded, German Made, Sold in pairs * Sockets made of corrosion/heat resistant resin, not plastic. * For the true do-it-yourself hobbyist! This loose set of sockets is sold without the mounting bracket, so make sure you have the proper distance when mounting them. * Approx single socket dimension: 1.25" high, 1.5" long, 1.75" wide socket base. * Deluxe socket ends have approx 1.0" thick sockets, providing superior protection of your bulb ends. * Sockets are rated for 5KV pulse. * Our 150/175W electric ballast will work with these. * When mounting HQI-150 bulb into this socket, make sure not to touch the quartz sleeve with your bare hands. All fingerprints should be wiped off with a clean cloth soaked with alcohol. * Do not mount without a UV filtering glass shield!! This bulb will put out UV radiation which can damage your eyes and skin, as well as your animals in the tank. The bulb MUST BE burned behind a protective glass sheet.