I pulled my pool light out, thinking I only needed to replace the bulb. Once I inspected it, I noticed that the black coating in the base of it where the bulb gets screwed in has bubbled and burst. I am thinking this is probably water proofing and I will need a whole new niche (don't know the correct termonogy for it). Can someone tell me if this is something I can install myself or will I need my pool man to come do it for me? I have managed to maintain my pool for the past 4yrs, so I am not above trying something like this. I have attached pics of light.