55Watt G55T8 Ultraviolet 83V UVC/UV T8-Tube G13 Lamp PT1660, PT1661, PT1663 Brand: LSE Lighting Bi-Pin (TWO pins on each END) SuperLife: 10,000hours - Quartz Glass Ultra Violet Length (in): 36 Replacement UV Bulb 55W for Laguna PT1660 PT1661 PT1663 Models