Guide: Replacing Your Inground Pool Light
If your pool light has stopped working or you notice water inside the fixture, don’t mess around. Pool light replacement requires the use of electricity near water, which can be dangerous if not done correctly. We replace inground and LED pool lights safely and correctly throughout the Houston area. Call us at 281-528-7575 if you need your light repaired without risk.
Safety Warning
Water and electricity kill people. That is not dramatic; it is a fact.
Never touch pool lighting without first turning off the power at the circuit breaker. Not just the switch. The breaker.
Before you touch anything, use a voltage tester to confirm that the power is turned off. Light switches can fail. Breakers can get mislabeled.
Make sure your pool light circuit has a functional GFCI. Press the test button on a regular basis to ensure that it works properly.
If you find water in the fixture, see corrosion, or feel uncertain at any point, stop and call a professional. This isn’t worth being hurt over.
Check These First Before Removing Anything
Don’t assume the bulb is dead until you’ve checked the obvious stuff.
1. Check the switch and timer
Make sure the light switch is actually on. Sounds stupid, but it happens. Toggle it a few times in case it’s sticky.
2. Check the breaker and GFCI
Find the breaker for your pool light. Flip it all the way off, then back on. Don’t just wiggle it.
Find the GFCI outlet or breaker near your equipment. Press TEST, then RESET. If it trips right away when you reset it, you’ve got a bigger problem that needs a professional.
3. Voltage checks
A qualified person can check voltage at the switch and at the junction box with a multimeter. If voltage is wrong or missing, the problem isn’t the bulb. Due to the risk, let professionals handle this.
How to Access the Light Fixture
Power needs to be OFF at the breaker before you start.
1. Remove the pilot screw
Most pool lights have one screw at the top holding a retaining ring. Remove it carefully.
Don’t lose this screw. Replacements are expensive for what they are — like $8 to $10 sometimes. They’re usually stainless or brass, specific to pool lights.
2. Remove the retaining ring
The ring usually has a tab at the bottom that hooks into a slot. Pull the top away from the wall first, then lift up to unhook the bottom. Set it somewhere safe.
3. Pull the fixture out
Grab the housing, not the lens or cord. Pull gently straight out. There should be several feet of cord coiled around the back that lets you bring the whole thing up onto the deck.
Don’t yank on the cord itself. The cord goes through a sealed fitting in the niche. If you damage that seal, you’re looking at a much bigger repair job.
Inspect Before You Do Anything Else
Power still needs to be off.
Check for water inside
Look at the lens. See water or condensation? That means the seal failed. Water intrusion causes corrosion and fixture failure. You probably need more than a new bulb at this point. Consider replacing the whole fixture.
Check for corrosion
Once you open it up, look at the socket and wiring. If there’s rust or green corrosion, the fixture is probably done. Corrosion means water got in and did damage.
Identify the bulb type
This is critical. You need to know exactly what bulb goes in there.
Voltage matters. Pool lights are either 120V or 12V. These are NOT interchangeable. Put the wrong one in and you’ll fry the bulb or worse.
Wattage matters too. Common ones are 300W or 500W, but check yours.
You might need to open the fixture to read what’s printed on the old bulb. It should say “pool light” or something similar, designed for underwater use.
Common Pool Light Manufacturers
The brand is important because parts aren’t always interchangeable. Most Houston pools use lights from one of the following manufacturers:
Pentair now owns several brands, including Pac-Fab, Paragon, Purex, American Products, Sta-Rite, and Swimquip.
If your light is any of the following, you’re looking for Pentair replacement parts.
Hayward manufactures the ColorLogic and CrystaLogic LED systems. Very common in this area.
Jandy manufactures the LumiPlus and WaterColors lights. Typically found in high-end installations.
Jacuzzi also produces underwater pool lights, although they are less common than the others.
To identify the brand, look at the fixture or the original paperwork for your pool.
When ordering replacement bulbs or fixtures, you must match the brand or select a compatible replacement.
LED conversions occasionally allow you to upgrade between brands, but the niche size and voltage must match.
Switching from incandescent to LED is essentially a new installation. Different fixtures may require different voltages. That is when you definitely want a professional to handle it.
Decision time
Based on what you see, decide if you’re:
- Just replacing the bulb
- Replacing the entire fixture assembly
If there’s water damage, age, or wear, replacing everything is usually smarter long-term.
Replacing Just the Bulb
Only do this if the fixture is dry and in good shape.
1. Open the housing
Find the clamp holding the lens to the body. It’s usually a metal band with a screw. Loosen it to separate the lens from the housing. Pay attention to how the gasket sits.
2. Remove the old bulb
Unscrew it from the socket.
3. Check the socket
Look inside for corrosion or damage. Light cleaning is okay, but if it’s heavily corroded, replace the whole fixture.
4. Install the new bulb
Triple-check that it’s the right voltage and wattage. Designed for pools.
Don’t touch halogen or incandescent bulbs with bare fingers. Skin oils cause them to fail early. Use a cloth or gloves.
Screw it in firmly.
Testing and Sealing
1. Quick test on deck
With the fixture on the deck and away from water, turn power back on at the breaker for a few seconds. Just long enough to see if the bulb lights up.
Turn power back off immediately.
Pool light bulbs get crazy hot when they’re not in water. The water cools them. Leave them on out of water and you’ll damage things.
2. Check the gasket
Clean the gasket and the surfaces where it sits. If it’s flat, cracked, or worn, replace it. You need a good seal or water gets in.
Using a new gasket every time you open a fixture is smart.
3. Reassemble
Put the gasket back in position. Put the lens on. Secure the clamp evenly and firmly.
4. Leak test
Power still off. Lower the reassembled fixture into the pool about a foot under the surface, lens facing up.
It’ll float because of trapped air. Hold it steady and watch for bubbles coming out.
Bubbles mean a leak. Pull it out, check the gasket and clamp, try again.
You can use silicone sealant as a last resort, but a proper gasket fit is way better. Make sure any sealant is pool-safe.
5. Fix any leaks
Repeat until no bubbles come out when it’s underwater. A leak will ruin everything eventually.
Put It Back In
1. Reinstall the fixture
Coil the excess cord around the back like it was originally. Guide the fixture back into the niche.
2. Secure it
Put the retaining ring back, making sure the bottom tab engages. Press the top flush and reinstall the pilot screw. Snug, not crazy tight.
3. Final test
Go turn the breaker back on. Flip the light switch. Confirm it works underwater.
When to Call a Professional
You found water or corrosion inside the fixture.
The breaker or GFCI keeps tripping.
You can’t get a watertight seal after trying multiple times.
You think the niche, conduit, or wiring is damaged.
The whole fixture needs replacing, including pulling new wire through conduit. That’s not a DIY job for most people.
LED pool light replacement is also more complex if you’re switching from incandescent. New fixtures, possibly new wiring, maybe a new transformer. Let pros handle that.
Replacing a pool light can be simple if it’s just a bulb. But the risks are real. Know when to stop and call someone. Your safety matters more than saving a service call fee.
Need help with your pool light? Call us at 281-528-7575. We handle inground pool light replacement safely and correctly throughout the Houston area.