The very purpose of stained glass - is to transform the light. Therefore, it is natural that it is often used as a frame of light sources. Most often it is used in large chandeliers, lamps, sconces and lamps. Lamps are decorated in different techniques of stained glass: Tiffany, fusing, beveling, stained glass film. The most spectacular is Tiffany stained glass, but in small lamps is also used the pseudo-stained glass film.
It's not uncommon that the whole ceiling, or most of it is made of stained glass, behind which are hidden light sources.