Sorry but you didn't explain what light really is. Only what it does... next debate will be particle or wave. I'd say that light is a wave at all times but is perceived as a particle when its wave form collapses, if it didn't, we wouldn't see anything.Still, what is light? To really, really, REALLY understand what this is, science have to peek at the metaphysical science as well. It isn't science if you don't venture ALL possibilities! But you will not find any useful answers there either and you'll eventually land on the conclusion that the more you learn, the smaller you become next to the wealth of information there is out there. We know nothing... but we're learning ;-)