GPH810T5L/4 GPH810T5L/4P GPH810T5L4 UV Lamp Bulb 39W Germicidal 31" Base Type: 4pins ONE END Length: approx: 31.89" (810mm) Effective Hours Rating: 12,000hrs Watts: 39W (compatible as 38W-41W replacement) Bulb Type: T5 Style Quartz Glass