Triple espresso?

I bought a light for treating my seasonal depression. Today is the first day I used it, as directed. I think it worked, but it may have worked a little too well. Between about 11am and 12:30, I was a little bit manic, wired, buzzed -- as if I'd had a honkin' huge hot cup of caffeine.

I don't really enjoy feeling that way. Tomorrow, I'm cutting the time I use it by 10-15 minutes.