7 Mistakes To Avoid When Lighting A Fountain Or Swimming Pool At Night

Learn how to pick the right underwater lights, avoid leaks and rust, and create a stunning water feature that lasts for over a decade.

Lighting a fountain or swimming pool at night looks simple — just buy a few cheap lights and stick them in the water, right?

If you've ever dealt with a fountain where half the lights stop working after 6 months, or a pool deck covered in ugly brown rust stains from cheap underwater lights, you know how wrong that is. Bad underwater lighting doesn't just look bad — it costs you thousands in maintenance, safety risks, and lost enjoyment of your water feature.

After 12 years supplying underwater lights to fountains, hotels and scenic areas across 80 countries, we've seen every mistake in the book. In this guide, we'll walk you through the 7 most common, expensive mistakes people make when lighting their water feature at night — and how to avoid all of them.

Mistake #1: Buying Cheap "Waterproof" Lights That Leak After 6 Months

This is the #1 mistake we see. Cheap underwater lights on Amazon or Alibaba claim they're "IP68 waterproof," but they're just IP65 splash-proof at best. They aren't fully potted, the seals are thin rubber, and the cable glands are cheap plastic. After a few months underwater, water vapor gets inside, fogs up the lens, and eventually burns out the electronics.

How to avoid it: Only buy lights that are genuinely IP68 rated, fully potted with epoxy, and tested for continuous submersion. Ask your supplier if they submersion test every batch — if they can't answer that, walk away.

Mistake #2: Using 304 Stainless Steel In Pools Or Coastal Areas

Another costly mistake: buying lights that look shiny, but are made with cheap 201 or 304 stainless steel. Pool water has chlorine in it. Coastal areas have salt in the air and water. 304 stainless steel will start rusting and pitting within 1-2 years, leaving ugly brown rust stains all over your nice stone pool deck. Those stains are almost impossible to clean off.

How to avoid it: Always use real 316 marine-grade stainless steel underwater lights. It has 3x the corrosion resistance of 304, and won't rust or stain, even in chlorine pools or saltwater.

Mistake #3: Running Underwater Lights On High Voltage

This is a dangerous one. Old underwater lights ran on 120V/220V line voltage. If the seal fails and the water becomes electrified, it's a serious shock hazard — especially for public pools and fountains where kids are playing.

How to avoid it: Always use 24V low voltage underwater lights. The voltage is too low to cause harm, even if someone touches the light in the water. It's code-compliant for public spaces, and much safer for everyone.

Mistake #4: Choosing Way Too Bright Lights

Have you ever seen a fountain at night that's so bright it looks like a stadium? It's blinding. A lot of people think brighter = better, but underwater lighting is about subtlety, not floodlighting the whole neighborhood. Harsh, bright lights glare off the water, look cheap, and ruin the peaceful vibe of your pool or fountain.

How to avoid it: Pick lights with 120 degree wide beam angles, and warm white or blue light instead of cool white. The goal is to light the water gently, not turn your fountain into a spotlight.

Mistake #5: Forgetting Maintenance Access

A lot of people install underwater lights where you can't reach them without draining the entire pool. When a light burns out 2 years later, you have to drain all the water, bring in a technician, swap the light, and refill the pool — costing hundreds of dollars in labor every time.

How to avoid it: Plan for access before you install. Use surface-mount lights instead of fully recessed ones, or install them near the edge of the pool where you can reach them without draining everything.

Mistake #6: Using Regular Transformers Outdoors

People buy the lights, then pick up a cheap indoor transformer from the hardware store to power them. Indoor transformers aren't waterproof. Rain gets in, shorts out the transformer, and suddenly all your lights are dead.

How to avoid it: Always use a waterproof, IP67 rated outdoor transformer designed for underwater lights. Mount it in a covered area, and size it properly so you aren't overloading it.

Mistake #7: Buying Lights With No Warranty

Cheap underwater brands sell you lights with a 30-day warranty, then disappear. When half the lights burn out a year later, you're on your own.

How to avoid it: Only buy lights from a manufacturer that offers at least a 3-year warranty. If a company won't stand behind their underwater lights for 3 years, that tells you everything you need to know about their quality.

Final Thought

Good underwater lighting doesn't have to be complicated — you just have to avoid these 7 common mistakes. Pick real 316 stainless steel, IP68 fully submersible, low voltage lights from a reputable manufacturer, and your fountain or pool will look stunning for over 17 years, with almost no maintenance.

If you're planning a pool or fountain lighting project, contact us today for a free layout recommendation and sample — we'll help you get it right the first time.