The Atlantic Ultraviolet G64T5L UV replacement lamp is a replacement lamp for the Aquafine CSL-8R/60, CSL-10R/60, CSL-12R/60, CSL-16R/60, CSL-20R/60, CSL-24R/60; the Wedeco CI-2L,CI-4L, CI-6L, CI-8L, CI-10L, CI-12L, CI-16L, CI-20L, >CI-24L; Ideal Horizons IH-2L, IH-2L-HT, IH-4L, IH-4L-HT, IH-6L, IH-6L-HT, IH-8L, IH-8L-HT, IH-10L, IH-10L-HT, IH-12L, IH-12L-HT, IH-16L, IH-16L-HT, IH-20L, IH-20L-HT, IH-24L, IH-24L-HT, IH-32L, IH-32L-HT, IH-40L, IH-40L-HT, IH-48L, IH-48L-HT as well as a generic replacement lamp for many other UV systems. The G64T5L is a 1 single pin double ended (B1) lamp that is 61 inches long (1554mm). The lamp operates at 75 Wattss with a quartz outside diameter of 15mm. It is extremely important to replace this lamp every 12 months to maintain proper system efficacy. As the key component of your UV system, the lamp renders micro-organisms harmless when they pass through the UV rays. Consistently exchanging aged lamps with fresh ones after 10,000 hours ensures you get the cleanest water your system can offer.