The Precision Lighting GPH357T5L/4P germicidal preheated lamp features ozone free design. Operating at 17 watts, this 4 pin single ended, T5 tube emits short-wave germocidal UV light. Measuring at 14.0625 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. Sold in a pack of 2.