So we are putting in an automatic pool cover for a client and they are asking if we can retrofit a color changing light into their pool. They don't have any lights in the pool now so I am not sure how to the best way to start is. Figured I would bore a hole on the pool then mortar/epoxy the housing in. Then drill down from the top(we are redoing the pool decking) and run the wires down so there are no holes below water level. I was hoping to find a light that was a smaller like 4" instead of the regular large 6-10" ones. Any advise or places to look would be helpful.