I have a happy light too actually. For me it didn't help the depression at all (mine isn't even slightly seasonal). It helped me stay awake when I worked night shifts back in college though.

Getting out would probably help but being stuck at home and isolated is part of why I'm not happy.

I have a life threatening allergy to synthetic scents which is almost everything. I have to avoid airborne stuff even, not just putting stuff on my skin. Like people doing their laundry makes my throat start to close up if I walk by their house when it's venting. Obviously I can't have most human contact. And finding a job that is 100% from home is difficult since I can't do anything that's based on phone calls.

If I could cure my allergies, I'd be able to handle the depression. Also I'd be able to get a job since currently I can't work in an cubicle.