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ASK THE EXPERT UV Light in Wintertime Winter is here in the northern hemisphere. Until the winter solstice (Dec. 21), every day will have less sunlight and more darkness than the day before. At many latitudes, all the UV that is present in the winter is UVA wavelength, not UVB. Remember, UVB rays are responsible for your body making vitamin D. So in the winter, it's impossible to make much vitamin D if you're living north of about 35 degrees latitude – and you still won't produce 30 and 35 degrees latitude. Despite this shortcoming in wintertime sun exposure, evidence has been presented that UV light does more than just make vitamin D. For example, it was UV light in general, and not 25(OH)D levels, that improved quality of life indicators in a recent study. So I still seek sun exposure in the wintertime, even without the UVB. While WANT TO KNOW MORE? 93 ❘ SMART TAN MAGAZINE ❘ SmartTan.com I continue to get UVA in the winter from sunshine, I keep a UVB light in my office for the winter as I think both moderate amounts of UVA and UVB light are important for health. If readers want a device for their own home and want to buy a UV light with UVB for home use (one that allows you to make vitamin D), you have several choices. One choice is Dr. Mercola's D-Lite UVB sun lamps: D-Lite stand up system. Another much less expensive system is Sperti's FDA approved vitamin D lamp: Vitamin D Lamp, model D/UVF. The Vitamin D Council approves both manufacturers. However, UVB lights can burn the skin so be careful to follow the manufacturers' recommendations. Dr. John Cannell is founder of the Vitamin D Council. He has written many peer-reviewed papers on vitamin D and However, you can also go to sun tanning businesses and ask to use a low-pressure UV sunbed, since they approximate the wavelengths in natural sunlight. speaks frequently across the United States on the subject. Dr. Cannell holds an M.D. and has served the medical field as a general practitioner, itinerant emergency physician, and psychiatrist. You can fnd related articles on the Vitamin D Council website at www.vitamindcouncil.org. Become a member today!