LSE Lighting compatible UV Bulb for Second Wind 1068 9" Model 1000KCS 56N99 Compatible UV replacement for Second Wind 1068 9" Model 1000KCS 56N99 Ultraviolet Germicidal Light Bulb - Provides Air Disinfection Must be replaced every 12 month Length: 8.35" (212mm), Base: 4Pin-T5 Ceramic Base Glass Type: Quartz Glass Tube, Socket: Connectors are 4pin single ended {SE} circling