Brand: LSE Lighting - Professional Ultraviolet Lighting (without Pigtail model) Bulb Type: Ultraviolet Germicidal Bulb UV-C 254nm; Base Type: 4pin with mounting flange around the base Length: Approx 14", Wattage: 27W; Approx Life Time: 1 year; Glass Type: Quartz Glass Tube; Quality Guaranteed; Highly effective inactivation of bacteria, viruses and parasites This UV replacement lamp by (LSE Lighting) brand is 100% compatible for use with TT-UV24-14 UV HVAC Systems. All lamps listed are compatible brand (LSE Lighting) UV products. We do not sell TopTech UV brand lamps. All TopTech UV brand names, trademarks and logos are property of TopTech UV respectfully. Warning: Ultraviolet Germicidal UVC light is harmful and dangerous to your eyes and skin. Please Use safety gear during installation.