G12 lights metal halide lamp,150w cmh lamps - CMH-T

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CMH lamps offer advantages that make them ideal for uses that range from accent and spot lighting to flood and area lighting:

Wikipedia tell you what is CMH(CDM)

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 themetal-halide lamp, which itself is a variation of the old (high-pressure)mercury-vapor lamp. The discharge is contained in a ceramic tube, usually made ofsinteredalumina, similar to what has been used in thehigh pressure sodium lamp. During operation, the temperature of this ceramic tube can exceed 1200kelvins. The ceramic tube is filled withmercury,argonandmetal-halidesalts. Because of the high wall temperature, the metal halide salts are partly vaporized. Inside the hotplasma, 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 aCRI(color rendering index) of up to 96. The exactcorrelated color temperatureand 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.

The ceramic tube is an advantage in comparison to earlierfused quartz. During operation, at high temperature and radiant flux, metal ions tend to penetrate the silica, depleting the inside of the tube. Alumina is not prone to this effect.

CDM lamps use one fifth of the power of comparabletungstenincandescent light bulbsfor the same light output (80–117 lm/W) and retain colour stability better than most other gas discharge lamps. Like other high-intensity discharge lamps, they require a correctly ratedelectrical ballastin order to operate.

Applications for these lamps include television and film making as well as shop lighting,digital photography, street and architecturallighting.

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