I had an idea, A light bulb that absorbs light making visibility zero in the effected area, depending on the amount power supplied in an electrical circuit. An example would be you place one of the light bulbs in a circuit that has a generator that supplies 250 watts (not very strong). It would slowly absorb 250 watts worth of lumen's, until it almost matches the output the power source. If the power source runs out of fuel it would slowly stop emitting its effect, until full visibility is returned.
I do believe this is a cliche.
All Feed back is appreciated.
Edit: Yea i do think this has been done if so, tell me