I replaced my bulb with a multi-color LED array (that looks almost exactly like the Pureline array suggested by InyoRob). I'm sorry, I can't find the part number or my receipt, but it was super easy to do. You will need a helping hand. It's basically a direct swap out. Be sure to replace the water-tight gaskets. I am so impressed by the LEDs. We hardly ever used the white light bulb before because it was so expensive to run (300W), then one time it just blew out which really made me mad. We use the LEDs almost every time we have people in the pool or just around it. We love it.