Hi C_V
I've got a SAD lamp and I do find it helps. It's definitely a different type of light than you get from a standard lamp. Wether it's all psychological or wether it physically makes a difference I'm not sure, but it does help. I'm sat with mine on now.
I got mine from Amazon. It wasn't very expensive. I could try to find you a link to the one I have if you like. I have had it a couple of years tho so might not be available still. I think there are lots on Amazon tho
Xx