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CMH grow light lamps or also called light-emitting ceramics are a relatively new source of HID light that is a variation of the traditional Metal Halide HID lamp. Not only do ceramic metal halide lights provide plants with a wide lighting spectrum, they use fewer watts and produce less heat than other types of lighting, saving you money in the long run. CMH metal halide grow lights are made with an arc tube constructed of a ceramic composite instead of quartz or PCA. This allows the tube to reach a higher temperature.