Pool Light Replacement: Costs, LED Options and What to Expect

Pool light replacement usually means swapping a failed halogen or old LED fitting for a new LED unit, and often the 12V transformer that feeds it too. At the time of writing (October 2026), South African repair price lists put the job from around R450 to R1,800, depending on the fitting, the cable and how easy the niche is to reach.

Most lights can be changed without draining the pool, because the fitting is built with enough spare cable to lift it out onto the coping. What decides the price is what we find once the old unit is out: a dry niche and a healthy cable, or water in the housing and corrosion on the terminals.

What pool light replacement involves

A typical underwater pool light sits in a niche, a recessed housing set into the pool wall below the waterline. The light itself is a sealed lamp unit held in place by a rim and screw. Behind it, a coil of cable runs through a conduit to a junction box or straight to the transformer at the pump room or DB.

On most South African pools the job goes like this:

1. The power to the light circuit is switched off and isolated at the DB before anyone touches the fitting.
2. The rim screw is removed and the light is eased out of the niche and floated up to the edge on its spare cable.
3. The old unit is opened or swapped on dry ground, and the cable, gland and seals are checked for water and corrosion.
4. A new sealed lamp or a complete LED fitting is connected, with fresh seals where the design uses them.
5. The unit is tested, the slack cable is coiled back into the niche and the light is screwed home.
6. The transformer and any timer or controller are checked so the new light switches on the way you expect.

That’s the short version. In practice, older pools throw up surprises. Some niches were built with too little cable to reach the coping, some conduits have collapsed, and some lights were never wired through a proper transformer in the first place.

Our team handles the pool side of the job and works with a qualified electrician for anything on the supply side. You can read more about what we cover on our pool lights installation and repair page.

LED pool light or a like-for-like bulb

If your pool still has an old halogen or incandescent light, pool light replacement is the moment to move to LED. Industry guidance notes that LED lights give the same or better brightness for a fraction of the energy and last far longer than the old lamps, which means fewer call-outs to change them.

You have two routes:

• Retrofit LED lamp: a new LED lamp that fits the existing housing, often in a standard size used by many local housings. It keeps the old niche and rim, so it’s usually the cheaper option.
• Complete LED fitting: a new sealed unit, sometimes a slim surface-mounted design. It suits pools where the old housing is cracked, badly corroded or no longer made.
• Colour and smart options: RGB lights that cycle colours, with a remote, wall switch sequence or app control. Many can be put on a timer with the rest of your equipment.

At the time of writing, SA pool shops list LED retrofit pool lights from around R690. Colour-changing and app-controlled models cost more. Before buying, check that the voltage and wattage match your transformer, and that the light fits your niche or rim size.

A smart LED pool light can be switched with your pump and cleaner through one controller. If you’d like the light on a schedule, our pool automation and timers service can tie it in with the rest of the equipment.

The pool light transformer

Most modern pool lights run at 12 volts. The pool light transformer steps the household supply down to that low voltage before it reaches the water, which cuts shock risk at the light itself. Electrical safety codes for pools treat the area in and around the water as a special zone for exactly this reason.

A few things go wrong with transformers:

• They are undersized for a new or extra light, so the light flickers or dims.
• They sit in a damp pump box and the terminals corrode.
• They have simply reached the end of their life after years of heat and moisture.
• An LED has been fitted to a transformer made for halogen, and the two don’t play well together.

At the time of writing, a 300VA 12V pool light transformer sells from around R719 at SA pool suppliers. Checking or replacing it is electrical work, so it’s done by a qualified electrician, not as a DIY swap.

Pool light replacement cost

There isn’t one fixed pool light cost, because the job ranges from a lamp swap to new cable, a new housing and a new transformer. These are typical third-party market figures at the time of writing (October 2026), not our own rates. Ask our team for a current quote for your pool.

What pushes the pool light cost up

A few things add time and parts:

• Short cable: if the light can’t reach the edge, the water may need lowering or a diver has to work in place.
• Damaged conduit: pulling new cable through a cracked or blocked conduit takes time, and sometimes digging.
• Corroded niche: old metal housings near the coast can be too far gone to reuse.
• Extra lights: adding a second light often means a bigger transformer.

If the light is part of a bigger refresh, it’s worth pricing it with the rest of the work. Our pool renovation cost guide covers the bigger items you might bundle with it.

Pool light not working? Check this first

A pool light not working isn’t always a dead lamp. Before you pay for pool light replacement, run through the safe checks you can do from the house side, without opening anything:

1. Check the light switch, remote or controller, and any timer that might be switching it off.
2. Look at the DB for a tripped breaker or earth leakage. If it trips again when reset, leave it off and call an electrician.
3. Look at the light from the pool edge. Water or fog inside the lens means the seal has failed.
4. For colour lights, check the manual. Some need a reset sequence after a power cut.

A light that trips the earth leakage is a warning sign, not a nuisance. It often points to water in the fitting or the cable. Keep swimmers out until it’s been checked. Our guide on why a pool light stops working goes through the common causes in more detail.

Do you have to drain the pool for pool light replacement?

Usually not. Most niche lights have enough spare cable to be lifted to the coping while the pool stays full. Draining is only worth it when the cable is too short, the niche itself needs repair, or the pool is being emptied for resurfacing anyway. Lowering the water for a light alone is rarely worth the cost and the risk.

Water ingress and coastal corrosion

Water getting into the housing is the most common reason a light fails early. A perished seal, an over-tightened rim or a cracked lens lets water in, and once it reaches the terminals the light dies and the earth leakage starts tripping.

Cape Town adds its own problems. Pools near the sea on the Atlantic side and along False Bay sit in salty, damp air, and that eats at transformer terminals, junction boxes and older metal niches. Salt chlorinated pools add salt in the water too. Our article on coastal pool equipment corrosion explains which parts suffer most.

A few habits help a new light last:

• Keep the pump box dry and ventilated, with the transformer off the floor.
• Ask for new seals every time the light is opened.
• Don’t run the light out of the water. Many fittings rely on the pool to cool them.
• Have the light checked during routine pool maintenance visits, before a small leak becomes a dead fitting.

Pool light questions

If the light is only one item on your list, our team can also look at the pump, filter and timers while we’re there through our pool equipment repair service. For the lighting itself, start with our pool light repair team.