Usage Tips:Compatible: for Sundance-spas Hot Tub Spas Water cleaner System 2012+, for spas series J-200, J-300, J-400, J-LX 6472-841, 6472-857, 3LRK, 94-1552, UVL-3LRK-1 Compatible: Also known as part numbers: 6472-841, 6472-857, 3LRK, 94-1552, UVL-3LRK-1 Packing: You get 2 Bulb . for better performance, Suggest replace the bulb every year. Help to reduce reparing cost Easy to Install: The light bulb is installed in the hot tub, remove the screws, enclosure cover and gasket in place, slide the replacement bulb back inside the quartz tube Notice: Backwards Compatible-Compatible with for older model Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you Colour:As Shown Material:Glass Package Contents: 2 * Pool and Spa Bulb Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.