This remembers me, when many years ago I worked with old chemical photography - used special light to limit parasitic exposure of film and photopaper. Usually

This remembers me, when many years ago I worked with old chemical photography - used special light to limit parasitic exposure of film and photopaper. Usually used dark red light, or yellow-green. And I lived in absolutely typical apartment, and used for photography ordinary bathroom, but switched off normal lights and used special lights, and apartments become looking like them from fantastic films. So, yes, my first education electronics and I've few times been at real fabs. At fabs there are two things which don't appear in typical homes - many devices emit ultraviolet and it is extremely powerful, so appear even through covers, or use open electric heaters, which emit red. Main lights I have seen there, where just ordinary fluorescent lamps, but I sure, on more modern fabs, used special lamps or color filters, to filter out part of spectrum which could cause unnecessary additional dose for photo-chemistry.