This is just a quick link to a site I found quickly from a web search. http://lightbulbsdirect.com/Merchant...ry_Code=Spiral These are compact flourecent bulbs. They are not too expensive, but are much better than standard bulbs. This is a link to the site that I got the 4 I am using. www.ozonelamp.com more pricey, but they offer larger wattage, full spectrum, and they are TiO2 bulbs.