I have a couple questions regarding LED light bulbs. I have HAYWARD pool lighting currently installed. I read a couple articles on how to replace the bulbs and I managed to unscrew the main light bulb housing to get my current model# which I believe is SPO583L. This is the bulb in the deep end. There is also another smaller about 3-4 inches in diameter in the spa. I would like to upgrade to LED Hayward bulbs and would like to know if the size of the bulbs are all universal for the deep end and the spa. What are the standard sizes? Where can I get HAYWARD LED bulbs for the deep end and the spa at a reasonable price? How is the selection of the colors in the bulb made? Sorry for the barrage of questions and any input is appreciated.