Replacement GENUINE BLACKLIGHT BLUE 6" BLB BULBS Fits all 6 inch handheld fluorescent blacklights These are true 'blacklight blue' or 'BLB' bulbs. Genuine blacklight spectrum bulbs are blue when off, and blue when on. They emit no white light, only UV. By comparison, cheaper versions of this type bulb are white when off, and purple when on, but emit white light which significantly dampens the blacklight effect. Size: in terms of exact measurement, this bulb is 5.75" from the ends of the pins on one side to the ends of the pins on the other. For perspective, the 6" store handheld (below) takes this same size bulb. Count on ...... SUPERSONIC, and on good days, LIGHTSPEED shipping. Or, to quote a buyer: "Tell the truth-it was in the mail BEFORE I ordered, right!?!". Usually orders make it outta Mission Control here either same or next day as receipt of payment (before about 3 p.m. PST makes it out that day). California residents expect to add sales tax at checkout for the gods of commerce here. If you're purchasing other items, will gladly combine shipping to save you XX dollars. Request an invoice and a reduced ship rate will be conjured up. Thanx for looking in ! On Nov-20-08 at 17:28:48 PST, seller added the following information: Sellers: Get your own map today. Click here now. Simple."