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.