Philip’s wake up light is one of the first products on the market which intend to wake you up with the illusion of daylight. It goes by saying the bright light works well for our alertness = wakes us up.
I think it’s a good idea but whether we can actually be woken up by just light is a question. For example I had the opportunity to try it out and I can say that it did not wake me up. It was definitely a pleasant light for night reading.