Wow, I never realized there were so many doctors here! I'm impressed.
Of course studying the problem one might just happen to learn a bit about what it is, and why light helps, and why the lights have to be powerful.
Seasonal Affective Disorder is real depression that has a seasonal component thought to have something to do with day length. I.e. much more in Alaska than Florida.
Phototherapy is all about lux. Not about UV, not about spectrum, not about color, not about source of the light. You need 10,000 Lux about 18 inches from your eyes for 30 to 60 minutes and usually in the morning.
Florescent is the way to go for low temp and with the reflector bright enough.
This is a very good supplier: Northernlighttechnologies.com. In Canada. I usually recommend the light that looks like a big desk lamp. That way you can leave it out all the time and not drag something out of the closet every day. Prices are reasonable, about $350 or so, maybe less. And that lamp is good for other things too if it is not helpful for your SAD.
On that web site there a few pics of people using that light. You don't stare in it the whole time, just glance toward it every few minutes while you read, do computer stuff, watch tv.
You should use it daily for two weeks for 60 minutes, if it is going to work it should within the two weeks then you could move down to 45 then 30 minutes. We have loaner units because it does not always help.
By the way the season here in Michigan for that is around October til April or so, then stop for the season. Just ending now.
Edit: your insurance might cover the light if your doctor writes "light for phototherapy of seasonal affective disorder." On a prescription for you to turn in to your insurance.