Lighting is one of the most critical – and most visceral - qualities of an indoor space. The difference between good and bad lighting can make or break comfort, mood and overall happiness in your home. Exposure to natural light affects your vitamin D and immune system, as well as your circadian rhythms, sleep cycle and hormones. Studies have linked lack of sunlight to depression (S.A.D), immune problems, diabetes and cancer. According to researcher and director of SUNAC (Sunlight, Nutrition and Health Research Center) William B. Grant, “over 20,000 Americans die prematurely annually from insufficient UVB/vitamin D, and half of those with multiple sclerosis in the U.S. would not have MS if they had had more UVB exposure.”

Energy Efficiency AND Good Health
Considering all of this, its frustrating that the building industry for the past 50 years has been primarily concerned with the energy element of artificial lighting, rather than human health concerns. Reflecting this industry bias, the LEED certification system doesn’t spend a lot of