Ever wonder why your face tanners or high-pressure units don’t seem to work as well after 700 hours as they did when the bed was new? This is due to a phenomenon called “Solarizing”, which effects all Blue and Black Filter Glass used in sun tanning
equipment. UVA is transmitted, but virtually no UVB - a principal requirement in the tanning process - is allowed through. Most photobiologists agree that PURE UVA IS HARMFUL TO THE SKIN. JUST LIKE
LAMPS, THE FILTER GLASS NEEDS TO BE REPLACED PERIODICALLY TOO! http://www.google.com/search?q=cache:www.amexport.com/vistalite.htm+uva+suntanning+
lamps&hl=en