Metal halide lamp

Details Metal halide lamp Metal halide lamp

H - Electricity

01

J

H01J 61/18 (2006.01) H01J 61/12 (2006.01) H01J 61/82 (2006.01)

Patent

CA 2292142

A mercury-free metal halide lamp with a light efficiency of at least 70 Im/W and a color rendering index of at least 80 has a ceramic discharge vessel, into which electrodes are introduced in a vacuum-tight manner. The fill comprises the following components: an inert gas which acts as buffer gas, a compound of a halogen X with at least one of the metals hafnium and/or zirconium (referred to below as metal halide HZM), this halide being referred to below as HZH for short, HZH simultaneously performing tasks of voltage gradient formation and of promoting the cycle, a light generator comprising at least a further metal halide, at least one further metal halide MY a which vaporizes readily and is used as voltage gradient generator, the specific molar content of HZH being greater than or equal to 3 µmol/cm3. In addition, the following relationship applies: 5 ~ (X+Y)/HZM ~ 15, resulting in a lamp service life of more than 5000 hours.

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