Yes CMH is ceramic metal halide...I just thought CMH was a better form of MH
found this on Wikipedia
Ceramic discharge metal-halide lamp
From Wikipedia, the free encyclopedia
The
ceramic discharge metal-halide (CDM) lamp, mostly referred to as
Ceramic Metal Halide lamp (CMH), is a relatively new source of light that is a variation of the old (high-pressure)
mercury-vapour lamp. The discharge is contained in a ceramic tube. During operation, the temperature of this ceramic tube can exceed 1200
kelvins. The ceramic tube is filled with
mercury,
argon and
metal-halide salts. Because of the high wall temperature, the metal halide salts are partly vaporized. Inside the hot
plasma, these salts are dissociated into metallic atoms and iodine.
The metallic atoms are the main source of light in these lamps, creating a bluish light that is close to daylight with a
CRI (color rendering index) of up to 96. The exact
correlated color temperature and CRI depend on the specific mixture of metal halide salts. There are also warm-white CDM lamps, with somewhat lower CRI (78-82) which still give a more clear and natural-looking light than the old mercury-vapour and sodium-vapour lamps when used as street lights, besides being more economical to use.
....doesn't say anything about Sodium being used in the CMH so I don't see how it could be a combo of HPS and MH...but it does sound like some epic vegging light.