Is there any physical law that prevents the electrons in the filament of a light bulb from emitting light? How come we always see light? What are the probabilities that all the electrons in the filament fail to emit light at the same time? I suppose there is a conservation law somewhere preventing this from happening. I'm not proposing that the electrons hold their higher orbit forever without releasing the photon/energy back, just that they fail to do do it at the same time. Has this ever happened (excluding a broken light bulb of course)? When I turn on the switch, do all the electrons emit light at the same time, or is this a random process were all the electrons emit a photon randomly but the overall effect is that we see the light bulb light up?