HAs anyone ver used these bulbs http://cgi.ebay.com/18-watt-UV-ESU-...hZ016QQcategoryZ67653QQtcZphotoQQcmdZViewItem I was looking for some bulbs on EBAY and cam accross this i figure i can buy 3 of these for the same price as 1 bulb from big als. Also if im running the UV 24/7 how often should i replace the bulb?
