The Hi-Tech Lamps part number F20T12/BL350-O is a 20 watt (20W) UVA blacklight lamp made by Osram. Used for Insect Trap, Fly Killer and Bug-Zapper units (Insect-O-Cutor Units). However, other applications include Industrial Processes and Special Effects. Blacklight Lamps differ from Standard Fluorescent Lamps only in the composition of the phosphur. This lamp has maximum overall length of 23.78in. It is a T12 bulb with two G13 medium bi-pin bases. The average rated lifetime of this lamp is 9000 hours. This lamp is also known as Osram F20T12/350BL/ECO and 22113.