How Long a Pool Light
Actually Lasts

There are two answers to this, and the gap between them is the whole point. The lamp inside a pool light is rated in hours. The fixture holding that lamp is rated by how long its seal keeps water out. In Pinellas County, the seal is almost always the number that runs out first — which is why a light can fail years before the bulb inside it was due to.

Key Takeaways

• Incandescent bulbs: commonly one to three seasons of normal evening use before they dim or burn out.
• LED fixtures: rated for 15,000 to 30,000 hours, which for most pools is a decade or more.
• The gasket usually goes first: a hardened seal lets water into the housing and ends the fixture regardless of the hours left on the lamp.
• Florida shortens both: year-round swimming means more run hours per year, and salt air attacks the niche, the fixings and the terminals.

What the Ratings Actually Mean

An incandescent pool lamp is a filament in a sealed housing. Run it a few hours an evening through a Florida swimming year and you are looking at a replacement every one to three seasons. That was normal for decades, and it is why older pools tend to have a light that somebody has already been into more than once.

An LED fixture is a different proposition. Rated at 15,000 to 30,000 hours, it draws up to eighty percent less power and runs far cooler, which matters more than the headline number — heat is what degrades the seal around it. Three hours a night, every night, is a little over a thousand hours a year. The arithmetic says a decade and more, and in practice that holds, provided nothing else fails around it.

That proviso is doing a lot of work, and it is the part worth understanding before you spend money on a fixture.

Why the Seal Fails Before the Lamp

A pool light lives in a niche in the wall of the pool, below the waterline, with a cord running back through conduit to a junction box above deck. The only thing keeping pool water out of the electrical parts is a gasket — a rubber ring compressed between the lens and the housing.

Rubber hardens. It hardens faster when it is cycled between hot lamp and cool water, which is exactly the duty an incandescent fixture gives it, and it hardens faster again in chlorinated or salt water. Once the gasket has taken a set and stopped springing back, it stops sealing, and water finds the inside of the fixture.

That is the moment the light's life ends, whatever the lamp had left. Water inside the housing corrodes the socket and the terminals, and in most cases it will trip the GFCI before you notice the lens has gone cloudy. A light that has stopped working is worth diagnosing rather than guessing at, because the fix for a dead lamp and the fix for a flooded fixture are not the same job.

What Florida Does to the Numbers

Two things, and they compound. The first is run time. A pool in a cold climate is lit for a handful of months a year; a pool in Pinellas is lit all twelve. The same fixture accumulates hours two or three times faster here, so a rating that sounds like twenty years elsewhere is a decade here.

The second is salt, and it does not only apply to saltwater pools. On the barrier islands and anywhere close to the water, salt in the air reaches the niche, the mounting screw, the conduit fitting and the junction box. None of those are the light, and all of them can end it. It is why we specify marine-rated components on exposed properties as standard rather than as an upgrade, and why we ask for the address before quoting a replacement.

Signs Yours Is Near the End

• Visible moisture, condensation or a waterline inside the lens
• The lens has gone yellow, cloudy or brittle
• Light output has dropped noticeably without the lamp having been changed
• The GFCI trips when the light is switched on, or trips intermittently while it runs
• Corrosion, staining or scale around the face ring or the mounting screw
• A second lamp has failed within a season of the first

Repair or Replace

If the housing is sound, the niche is clean and the conduit is dry, a lamp or a gasket is a repair and should be priced as one. If water has been inside the housing, if the niche has corroded past the point a new seal will hold, or if the fixture is old enough that parts are no longer made for it, replacement is the honest answer and usually the cheaper one over any sensible horizon.

The case for going to LED at that moment is strong, because the labor is already being spent. Most current retrofits are built to drop into the standard niches that have been in use for decades, so the swap is straightforward where the conduit and bonding are in good order. Color systems and deck lighting are worth considering at the same time for the same reason — the expensive part of the job is access, and you only want to buy it once.

What we will not do is sell a fixture to solve a fault that is behind it. A new light on a failing niche trips in exactly the same way the old one did, and you will have paid for it twice. We inspect the whole circuit and quote once.

Frequently Asked Questions