At some point in time the light in your swimming pool or spa will need to be replaced. Replacing the light itself is not that difficult. Before purchasing a replacement pool or spa light, you will need to know some general information to help make sure that you buy the right one. This guide will point out the main differences and help make your search a little easier.
Size matters- Swimming pool light are larger than spa lights. The most common swimming pool lights are 10 ¾” in diameter (including face-ring). Spa lights are usually 6” in diameter (including face-ring). The most common manufacturers would be Hayward, Pentair/Sta-Rite (older styles were Purex/PacFab), SwimQuip and Jandy. Always measure your light. I have seen cases where a spa light was installed in a swimming pool and a swimming pool light was installed in a spa.