Featuring an ozone free design, the Precision Lighting GPH463T5L/4 germicidal preheated lamp operates at 22 watts. This 4 pin single ended T5 tube emits short-wave germocidal UV light. Measuring at 18 inches in length, the germicidal lamp has an impressive life rating of 10,000 hours. Use this germicidal lamp for sanitation and purification applications. This bulb should not be used for illumination purposes.