http://articles.mercola.com/sites/articles/archive/2006/10/10/more-evidence-of-the-benefits-of-full-spectrum-lighting.aspxScientists have discovered a new receptor in the eye that, among other things, monitors your biological clocks. Apart from the other photoreceptors in your eye that allow you to see, this "third eye" responds differently to light by sending signals toenCommunityServer 2008.5 SP1 (Build: 31106.3070)