My pool has been empty for a few years and I had a pool contractor come look at some things before I get the pool up and running. One thing he mentioned was replacing the bulb in our pool light. The light works just fine right now, but I don't know how old it is, or if there are any problems with it being water tight. Would it be a good idea to replace the bulb now while the pool is still empty? Or is there no reason to since it works right now?