energy bulbs
~chuckles~...here's the line of thought for that one....
As Al-Ka had predicted, the energy bulbs in the Nest, except where they had actually been destroyed by the fire of Sarm’s silver tubes, came on again.
Former Mul engineers, trained by Priest-Kings, had constructed an auxiliary power unit and had fed its energy into the main system.
When the lights flickered and then burst into clear, vital radiance there was a great cheer from the humans in Misk’s camp, with the exception of the Gur Carriers to whom the energy bulbs were not of great importance.
Priest Kings