| 摘要 |
A metal halide discharge lamp for photo-optical purposes contains an ionisab le filling consisting of mercury, at least one rare gas, at least one halogen, aluminium (Al) and Indium (In) and also gallium (Ga). The Ga additive, typically in the range between 0.02 and 1 mg/cm3, reduces the striking volta ge while maintaing an Ra > 85 at colour temperatures typically between 5000 and 11000 K.
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