F40BLB Blacklight Blue Satco Nuvo S6409

BLB - F40BLB 48" BlackLight BLUE Satco S6409 RS = Rough ServiceBLB - BlackLight Blue (BL = BlackLight)F = Fluorescent 40 = 40 WattsT12 = thickness (Width) of Tube Cross Ref:F40T12/BLB/RS BlackLight Blue Dr 00791A F40BLB BlackLight Blue GE 10531F40BLB BlackLight Blue Satco Nuvo S6409F40BLB BlackLight Blue GE 10531 DISCONTINUEDF40BLB  BLB-F40T10 BLB BlackLight Blue HIKARI DISCONTINUEDINDIGLOW F18T8BLB LED T8 48" BLACKLIGHT Ushio 3000677 Quantity Per Case: 12/6 pack  BLACK LIGHT & BLACK LIGHT BLUE - What's the difference?  Black Lights in general, are fluorescent lights that are designed to emit a specific type (UVA) of ultraviolet light, although a small amount of visible light. Black Lights are good for making certain substances that would normally be invisible glow (or "fluoresce"). For example, you may have had your hand stamped at an amusement park with an invisible ink that, when viewed under a black light, glowed a bright neon color. Fluorescent Black Lights are great to use