How to Change a Pool Light Bulb
If your pool light has gone out, don’t panic—changing a pool light bulb is easier than you might think. While it might feel intimidating at first (electricity and water together don’t sound like a great combo), this is actually a relatively safe and manageable DIY task—if you follow the proper steps.
Whether you want to swap out a burnt bulb, upgrade to LED, or just restore that crystal-clear nighttime glow, we’ve got you covered. Here’s how to do it the right way.
What You’ll Need
- A replacement bulb (make sure it’s the correct voltage and size for your fixture)
- A flathead screwdriver
- A Phillips screwdriver (sometimes both are needed)
- A clean, dry towel or cloth
- A lens gasket (optional but recommended)
- A pair of dry hands (mandatory!)
- Teflon tape (for re-sealing if needed)
Step-by-Step: Changing a Pool Light Bulb
1. Turn Off Power to the Pool
This is non-negotiable. Locate your pool’s circuit breaker (usually near the pool equipment or in the main breaker box) and turn off all power to the pool lighting system. Double-check by flipping the switch and seeing if the light stays off. If in doubt—test it again.
2. Remove the Light Fixture from the Niche
Underwater pool lights are typically held in place by one screw (called the “screwlock”) at the top of the fixture. Use a screwdriver to remove it. The fixture is attached to a long cord, so you should be able to gently pull it up and place it on the pool deck.
Tip: Have a towel nearby so you can rest the fixture on it and avoid scratching the surface.
3. Disassemble the Light Fixture
Once the fixture is out of the water and on a dry surface, carefully remove the screws holding the lens and housing together. Open it up and take note of how it’s assembled—maybe even take a quick photo with your phone, just in case.
Inside, you’ll see the old bulb and a rubber or silicone gasket that seals the unit.
4. Replace the Bulb
Carefully unscrew the old bulb and screw in the new one. Avoid touching the new bulb’s glass with your fingers—use a cloth or gloves. Oils from your hands can shorten the life of the bulb.
If the lens gasket looks worn or brittle, replace it with a new one to avoid future water leaks.
5. Reassemble the Fixture
Put everything back the way it was: gasket, lens, housing, screws. Double-check the seal—this is crucial to prevent water from entering and ruining the bulb or causing electrical problems.
Some people like to use a thin ring of silicone sealant around the gasket. If you do, make sure it’s rated for underwater use.
6. Test the Light Before Submerging
With the fixture still on the pool deck, turn the power back on briefly to make sure the new bulb works. If it lights up, turn the power off again and prepare to reinstall the fixture.
Never test the light while it’s still submerged unless it’s completely sealed and designed to do so.
7. Reinstall the Fixture into the Pool
Once you’ve confirmed everything’s working, place the light fixture back into the pool niche and secure it with the screw you removed earlier. Make sure it sits flush and tight.
Pro Tips
- Always double-check your pool’s manual for the specific type of bulb and wattage required.
- Consider upgrading to LED bulbs. They last longer, use less energy, and offer multi-color options.
- If water has gotten into the fixture, you may need to let it dry out completely—or replace the whole unit.
When to Call a Professional
If you notice frayed wiring, damaged sealing, or water inside the lens, it’s best to call a licensed pool technician. Also, if your breaker trips when turning on the light, it could be a sign of deeper electrical issues.
Safety first: when in doubt, let the pros handle it.
Final Thoughts
Changing a pool light bulb isn’t rocket science, but it does require patience, care, and—most importantly—safety. With the right tools and a little bit of know-how, you can bring that nighttime shimmer back to your pool in under an hour.
Whether you’re fixing a dim glow or stepping up to sleek new LEDs, don’t let a dark pool ruin your vibe. Light it up—and dive back in.