Benefits of a Light Box for Those Without SAD?

I  thought I read in my research somewhere that a light box would have no affect on those without Seasonal Affective Disorder.

Anyone seen any of the papers on this? I was at a conference today (Inspire Scotland 06) where one of the speakers (Janey Lee Grace) said that she used one in winter to help her feel good and a couple of the attendees had tried this too and benefitted from it.

Janey’s website http://www.imperfectlynaturalwoman.com is all about looking good and feeling good using all natural products - good for you as well as the planet. And she believes a light box may be a way to feel good naturally for most people.