The Hi-Tech Lamps part number F25T8/350BL-O is a 25 watt (25W) 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 17.78in. It is a T8 bulb with two G13 medium bi-pin bases. The average rated lifetime of this lamp is 7500 hours. This lamp is also known as Osram F25T8/350BL/18in/ECO and 21703.