Pool Light Burned Out? Replace It with LED Instead of Another Bulb

It happens the same way every time. You flip the switch for an evening swim and the deep end stays dark. The 300W or 500W incandescent bulb in your pool light has burned out again, and if your pool was built before the mid 2010s, this is probably a ritual you know well: order the bulb, order a new lens gasket, pull the fixture up onto the deck, swap everything, reseal it, and hope the seal holds.

Before you order another bulb, it is worth running the numbers on the alternative. Converting that fixture to a modern LED replacement usually costs less over a single season than staying on the incandescent treadmill, and it permanently ends the bulb and gasket cycle.

Why the Bulb Keeps Burning Out

The classic large pool light, the kind sitting in a 10 inch wet niche like a Pentair Amerlite or Hayward AstroLite, runs a standard incandescent flood bulb. Incandescent bulbs are rated for roughly 1,000 to 5,000 hours of life. Run your pool light four hours a night through a Florida swim season and you can burn through that rating in one to three seasons. The heat those bulbs generate also works against the lens gasket, which is why so many owners find moisture inside the fixture right around the time the bulb dies.

So the real cost of staying incandescent is a recurring one: a bulb, a gasket, an hour of your time, and a reseal that has been known to fail and let water reach the socket. Many owners do this every other year for decades.

The Math: Another Bulb vs. an LED Conversion

Start with electricity. A 500W bulb running four hours a night for a six month season uses roughly 360 kilowatt hours. At typical residential rates that is in the neighborhood of $50 to $60 a season for one light. A modern LED replacement drawing under 50W does the same job for well under $10.

Then add the hardware cycle. Replacement flood bulbs and gasket kits typically run $40 to $80 together, repeated every one to three seasons, plus a service call if you are not doing the swap yourself. Meanwhile an LED fixture is rated for 50,000 hours. At four hours a night, that is decades of use with no bulbs and no gaskets to buy.

And the LED does something the incandescent never could: full RGB color. Instead of one warm yellow-white, you get color modes and a clean bright white, which is most of the reason people upgrade even when their bulb still works.

Will an LED Fit Your Existing Fixture?

If your light is the classic large round fixture, about 10 inches across, sitting in a wet niche with a single screw at the top of the ring, you have the standard large niche format. Millions of American pools use it. Our 10 inch LED replacements are built as drop-in fits for that niche: the fixture comes up onto the deck the same way your old one does, the new light connects at the same junction box, and the whole swap typically takes about 30 minutes with basic hand tools. No pool drain required.

What the Swap Looks Like

First, kill power to the light circuit at the breaker. Remove the single securing screw at the top of the fixture ring, tilt the fixture out of the niche, and float it up onto the deck. The extra cord coiled behind the fixture in the niche is there exactly for this. Disconnect the old light at the junction box, pull the new light's cable through the conduit, connect it, and reinstall the fixture in the niche. Restore power and you are done.

One electrical note: our 10 inch LED replacement runs on 12V AC. Most classic incandescent installs are 120V, so the conversion includes adding a compact 12V transformer at the equipment pad, a quick job for the electrician who is already handling the junction box connection. Our Smart WiFi Pool Light Transformer covers it and adds app, voice, and remote control of your pool light at the same time. If your existing fixture is already 12V, the light is a direct swap.

Water and electricity deserve respect, so if anything about the wiring is unfamiliar, have a licensed electrician or pool professional handle the junction box connection. The niche and bonding system in your pool exist to keep this job safe, and they only protect you when the work is done correctly.