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I try to understand how is possible to turn a photo receptive sensor into an emitter of light.
Settings, tools, modulation..

Jacky Ned
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In the general case, you can't. Not all processes are reversible. For example, a Cadmium-sulfide photoresistor won't emit light when you apply a voltage to it.

There really shouldn't be the expectation that this would work in general since there are so many every day examples. Your car doesn't put gas back into the tank when going down a hill. You don't get less hungry by walking down a mountain. Etc, etc, etc.

Olin Lathrop
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