Have you ever used a SAD lamp?

I tend to get really unhappy in the winter (no formal diagnosis of seasonal affective disorder or anything though) and my counselor thinks I should get a SAD lamp. I think it’s a good idea.

I’ve heard you should make sure to get one with a brightness of at least 10,000 lumens and that outputs no UV. Any other requirements I should be on the lookout for?

Have you or someone you know used one? What has your experience been?