I know a few people who've used them and I've had conflicting anecdotal reports, so on that (flimsy) evidence it would seem to work for some and not others.
I take the point about 'any bright lights will do' but I think these have softeners so it isn't burning a hole in your eye socket, so to speak.
I'm a photographer so I sometimes switch off all the room lights and set up some highly controllable studio lights, to very soft settings (not bright at all). Hands up, I couldn't really say if it does anything for me (but the younger generation in the family think it's cool!)
I definitely couldn't handle a bright light for any length of time.
