This T9 210mm diameter 22 Watt Circular Fluorescent Tube features a special Blacklight 350 colour temperature. Blacklight lamps are designed for use in insect-o-cutor (fly killer) units industrial processes and special effects in night clubs and bars. This lamp offers excellent colour rendering stable uniform light distribution and an impressive 10000 hour lamp lie. Please note this is a circular fluorescent fly kiler tube only and requires a fly killer unit to operate.