The Graham Field-2223E is a specialized 6-watt replacement ultraviolet tube designed for the Grafco diagnostic lighting line. This long-wave (365nm) tube, also commonly known as a "black light" tube, is the primary light source for the 2211 and 2212 handheld UV lamps. It is engineered to provide consistent UV intensity required for identifying fluorescence in dermatological, forensic, and laboratory applications. The tube is easily user-replaceable, ensuring that diagnostic equipment can be maintained with minimal downtime.