The ceramic discharge metal-halide (CDM) lamp, often referred to as Ceramic Metal Halide lamp (CMH) is a source of light that is a type of metal-halide lamp which is 10-20% more efficient than the traditional quartz metal halide[1] and produces a superior color rendition (80-96 CRI).[2]
Applications for these lamps include television and film making, shop lighting, digital photography, street lighting, architectural lighting and agricultural lighting including grow lights. A CMH light was first exhibited by the Thorn Lighting Group in 1981 at the Hannover World Light Fair, and the first commercial CMH lamps were distributed by Philips in 1994.
The term "Light Emitting Ceramic" or "LEC" is sometimes improperly used to describe ceramic discharge metal-halide grow lights in general, though that term is actually the registered trademark of a specific brand of ceramic discharge metal halide light.
The newest release of these lights claim to use around half the electric watts as the HPS equivalent saving money throughout the grow. I have personally seen some of these grows and they have been very impressive however... please make sure its full spectrum lights you look at and not the older style ones.
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