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See the Light
People who get seasonal affective disorder, or SAD, have been shown to feel better when they're exposed to specially rated UV lights for the home for 20 minutes a day. Any bright light will serve the purpose, and halogen lights emit the same frequency as those made to treat SAD.
Another option? Go to sports events or arenas where there are a lot of bright lights. Anecdotally, these lights seem to have the same effect.