| 摘要 |
<p>Disclosed herein is a metal vapor discharge lamp comprising a light-emitting tube (2) in which bismuth is filled together with mercury, a rare gas, iron and a halogen in the range of 1/20-6/1 in terms of the gram atom ratio of bismuth to iron (Bi/Fe). A metal vapor discharge lamp comprising a long light-emitting tube (2) having an inner diameter D of 18-35 mm, equipped with a pair of electrodes (2, 2) and having an electrode interval L of 750 mm or greater, in which bismuth is filled together with mercury in a sealed amount of 0.6-2.0 mg per cc of the internal volume of the light-emitting tube (2), a rare gas, iron and a halogen in the range of 1/20- 6/1 in terms of the gram atom ratio of bismuth to iron (Bi/Fe) is also disclosed. <IMAGE></p> |
