Has anyone done work on gathering sunlight? An indoor grow might benifit from a passive/active gathering setup.
Not really, passive light into contemporary building design is done. Why not try it? Just because it's a new idea for an indoor grow shouldn't stop it from being used. After all sunlight is what grows the best crop!
As long as it only shines when the light schedule dictates it. You must have complete darkness during the lights out during flowering. Indoor lighting is a lot easier to control.