Can you fix a leaking pool light niche without draining the pool?

Yes, you can fix it with underwater epoxy putty like AquaMend or JB WaterWeld. Turn off the breaker, clean the area with a brush, dry it, then press the epoxy into the leak. Let it cure 12–24 hours before turning the light back on. This works for hairline cracks or bad sealant, but if you’re losing an inch of water daily, you likely need a new niche.