| 摘要 |
<p>Disclosed is a lighting lamp comprising a light-emitting tube (10) in which lutetium (Lu), lithium (Li) and a halogen are sealed together with mercury and a rare gas. The lighting lamp satisfies the following conditions (1) and (2): (1) the proportion Li/Lu (the ratio in terms of the number of atoms of lithium to lutetium) is 0.5-1.5; and (2) the sealed amount of the halogen is the total amount of a standard amount in which the halogen form halides with lutetium and lithium to be sealed neither too much nor too less and an excess amount of 0.5 x 10<-><6> - 4 x 10<-><6> molecular mole/cc based on the internal volume of the light-emitting tube. t</p> |
