Megaphoton 315W Single Ended CMH Grow Light FixtureMegaphoton 315W Single Ended CMH Grow Light Fixture is the most efficient Ceramic Metal Halide (CMH) lamp on the market. The Megaphoton housing keeps the electronics cool, significantly reducing the possibility of faults and extending its operating life. In independent tests, the fixture came out as the coolest. To distribute the light, Megaphoton 315W has high efficient reflectors which deliver unprecedented uniformity of light.