Prime Fluorescent Black Light Tube. We made a special purchase of many of the most popular blacklight tubes and are passing the savings on to you! All tubes are brand new and are the Black Light Blue (BLB) type. Hurry - these won't last long. F15T8BLB Blacklight Tube. Watts: 15, Base: G13, Made to use in 120VAC Fluorescent light fixture. Size: 17" x 1" Dia.