Not advisable for everyone. I have been warned by my eye doctors to not go out in the sunshine, even on cloudy days, without sunglasses. Wide pupils and very light blue irises are the issue. My Dad had them too & he ended up so light sensitive that he had to pretty much keep rooms completely dark.
As for the red light, I had read in other studies about the effectiveness of green light to combat migraines, so I found this completely interesting.