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My fiancee and I were talking about this. The spot in the venue we plan to set up the photo booth is going to be a little darker so using a video light that just stays on might not be a bad idea.I have been debating on the other option you mentioned as well, just turn the light on when the button is pressed and keep it on until the series of photos is done. I still struggle with how to wire it up because it would have to have its own power source and the Pi would just trigger a switch. Sadly being a novice with electronics I am having a harder time figuring out how to set this up. Everything else, the button, indicator LEDs, camera, and screen all are much easier to set up and control.