What's the matter with the light bulbs?
Tungsten electrode, turn off the light inside, inside with mercury vapour, through high pressure mercury vapour breakdown, and consumption of tungsten electrode, electric light, may be a poor contact circuit aging or light foot, if end black gathered themselves together, and it is also possible that a serious of tungsten electrode burning, still hope electrician check and to avoid an accident!
It's the regenerator problem, or the regenerator block.The wiring didn't catch up.
The filament is old or broken, one is to increase the voltage, the second is to change the new tube.
