LSE Lighting GPH640T5L/4P GPH640T5L/4 Ultraviolet UV Lamp Bulb 4-pin Base 25 1/4" Brand: LSE Lighting - Professional UV Lighting Brand Bulb Type: Ultraviolet Germicidal Bulb UV-C 254nm Length: approx 25 1/4" inches (640mm) Base Type: 4pin (4pins on ONE END); Warranty: 1 year (recommend to replace every 12 month); Glass Type: Quartz Glass Tubel; Effective Hours Rating: 12,000hrs Warning: Ultraviolet Germicidal UVC light is harmful and dangerous to your eyes and skin. Please Use safety gear during installation.