Most local electrical codes require that swimming pool electrical work be performed by a licensed electrician. Remember that water and electricity don't mix. If you notice anything that "looks" questionable or possibly hazardous, have it checked out immediately by a licensed professional electrician.
Underwater Swimming Pool Lighting
Underwater lights have become a common, standard item in all pools. There are many manufacturers of pool light fixtures on the market, led pool lamps are now being installed, as well as fiber optic decorative lighting that can run above or below water.
Your underwater lighting should give you few problems. Most traditional pool bulbs lifespan is 1,000 hours before replacement is necessary. The underwater pool light fixture can last several decades, however, corrosive pool chemistry can weaken the underwater light fixture and the screws which hold a pool light together, and this may necessitate replacement.