How To Install Underwater Pool Lights

Thinking About Installing Underwater Pool Lights? Here’s What You Need to Know

If your pool feels a bit dull at night, underwater lights can totally change the vibe—think resort-style elegance right in your backyard. Plus, they’re great for safety, making it easier to see where you’re swimming after dark.

But before you get started, here’s what actually matters.

Choosing the Right Underwater Pool Lights

You’ve got options, and not all pool lights are equal. Here’s what to look for:

1. LED vs. Halogen
LED lights are the way to go. They last way longer, use less power, and give you more colour options. Halogens are old-school, burn out faster, and cost more to run. Simple choice, really.

2. Colour Options
Do you just want bright white light, or do you want colours that can change with a remote? If you like to set the mood or entertain, colour-changing LEDs are worth it.

3. Flush-Mounted or Surface-Mounted?

Flush-mounted lights sit neatly against the pool wall, looking more high-end.
Surface-mounted lights are easier to install because they just attach to the pool surface. They stick out a little but do the job well.

If you’re retrofitting to an existing pool, surface-mounted is usually easier (less messing with the pool structure).

For a great selection of pool lights in New Zealand, check out The Pool & Spa Warehouse or Paramount Pools for local options.

What You Need for Installation

Alright, so you’ve picked your lights. Now let’s talk about what you’ll actually need:

Lights and fittings (obviously)
A low-voltage transformer (Most pool lights run on 12V, so you’ll need this to convert your home’s power supply)
Waterproof cable & conduit (to protect wires from getting damaged)
A drill with masonry bits (if installing in a concrete pool)
A screwdriver & wrench

If you’re unsure, supply stores like Bunnings NZ or Mitre10 can help with the right cables, transformers, and tools.

Installation Steps

If you’re replacing an old light, it’s just a matter of swapping out the fitting. If you’re wiring in new lights, here’s the process:

1. Turn Off the Power

Before touching anything electrical, make sure the power is off at the mains. Double-check with a voltage tester.

2. Position the Lights

Decide where your lights are going. Most pools need at least 2–3 lights spaced evenly to avoid shadows.

3. Drill & Mount the Housing (If Required)

For concrete pools, you’ll need to drill into the wall and secure the housing for the light. If you have a fibreglass or vinyl pool, follow the manufacturer’s mounting instructions.

4. Run the Wiring

For a retrofitted light, run the waterproof cable through the conduit and connect it to the transformer.
For new installations, routing the wiring properly is key—make sure it’s watertight and runs through a junction box above the pool level.

5. Connect to the Transformer

Mount the transformer somewhere dry and safe. Then, connect the light wiring to it. If you’re not comfortable doing this part, get an electrician to handle it.

6. Test & Seal Everything

Once everything’s connected, test the lights before sealing anything up. If they work fine, secure all the fittings and waterproof the connections.

DIY or Hire a Professional?

Honestly, if you’re confident with wiring and basic installations, you can probably handle a replacement light yourself. But for a full new install, especially for in-ground pools, it’s often easier (and safer) to get a professional electrician.

You can find registered electricians on Master Electricians NZ or ask for a recommendation from your local pool shop.

Maintenance Tips

Once your lights are in, here’s how to keep them working well:

Check for water leaks regularly—condensation inside the light housing is bad news.
Replace faulty bulbs quickly to avoid electrical issues.
Clean the lens to remove any algae or calcium buildup.

Ready to Light Up Your Pool?

Installing underwater pool lights isn’t as tricky as it seems, but it does take a bit of planning. Whether you go DIY or call in an expert, the right lights can make a huge difference in how your pool looks and feels at night.

Need lights? Start with local retailers like Spa & Pool Warehouse or Paramount Pools. Want professional installation? A qualified electrician can set things up safely.

Either way, once those lights are on, your pool will go from “nice” to “next-level amazing.”