You can get the special 'lamps' that are specially for S.A.D. and you sit under them for a certain amount of time (and no more). I think you can get them and Bed, Bath and Beyond and I'm sure other places too. I can't for the life of me remember the actual names of them. But if you just ask for lamps for S.A.D. I'm sure you'll find one.

Many people have them and they work great. I don't have one (yet).