The Atlantic Ultraviolet GPH810T5L4 germicidal preheated lamp features ozone free design. Operating at 29 watts, this 4 pin single ended, T5 tube emits short-wave germocidal UV light. Measuring at 24 inches in length, the germicidal lamp has an impressive life rating of 10,000 hours. Use this germicidal lamp for purification and inspection applications. This bulb should not be used for illumination purposes.