| abstract |
An outer tube for an external electrode fluorescent lamp capable of manufacturing an external electrode lamp having high energy efficiency even when a temperature around the lamp increases. A fluorescent lamp envelope used for manufacturing an external electrode fluorescent lamp having electrodes provided near both ends of an outer peripheral surface of a lamp envelope, comprising a transparent glass tube, comprising the glass tube. The glass has a volume resistivity at 150 ° C. of Ω · cm of 13 or more in log representation. [Selection diagram] Fig. 1 |