| 摘要 |
PROBLEM TO BE SOLVED: To obtain a white and bright lamp, which makes user's economical burden light, because the lamp life is long. SOLUTION: The lamp consists of a rare gas, a halide of Sc(scandium), a halide of Na(sodium), and adding a 3rd additive in luminescence valve. The 3rd additive is a metal or halide of a metal. The 3rd additive is selected from the thing that has the ionization voltage in the metal simple substance is 5 to 10(eV), and the steam pressure of the 3rd additive determined at a lamp temperature at operation is 1*10<-5> (atm) or higher.
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