Indoorsgrowing

What Is A Ceramic Metal Halide Grow Light? First, let’s clear up a point of confusion. I’m sure you’ve seen (even just in this article), several different terms and abbreviations. Ceramic Metal Halide  (CMH) grow lights , Light Emitting Ceramic (LEC) and Ceramic Discharge Metal Halide (CDM) all refer to the same thing. CMH is the most common term. Another point of confusion concerns their relationship to metal halide lights.  CMH bulbs  are a variation of MH bulbs, but they are quite different. Instead of using a quartz tube, they use a ceramic tube (more here), similar to an HPS bulb. This allows a higher arc tube temperature, which in turn allows a better mix of gases to produce a more optimal spectrum (more on this below in the sections comparing CMH to MH and HPS). The light produced by a CMH bulb is much closer to natural sunlight than either MH or HPS (with a CRI of 96). It is, for practical purposes, a perfect combination of MH and HPS in a single bulb. Ad...