One day this Spring, after endless day after day after day of clouds/rain/grey skies I'd about had it. Finally got this light box after thinking about it for awhile - now wish I would have gotten it much sooner, back in the middle of winter! I definitely noticed an improvement in my mood and energy level - I can actually "feel" the light working - that sounds crazy, but it's true! I started out with just 5" at a time, then upped it to 10" after a couple days, and gradually worked my way up to 20See full review