Pools · Service

Pool lighting installation, which is electrical work, not decorating

A light fitting submerged in water that people stand in is not a lamp. Here is what a proper installation involves, what can actually be retrofitted, and where the DIY line sits.

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In short

What is pool lighting installation?

Pool lighting installation means fitting a luminaire into a niche in the pool wall, running its cable through conduit to a junction point above the water line, and connecting it through appropriate protection — with the niche, the fixture and the surrounding metal tied into the pool's electrical bonding system. In an existing pool, most of the job is determined by what is already buried: the niche, the conduit and the cable route. Changing the fixture is often straightforward; adding a light where there is no niche means opening the pool shell and usually the deck.

Triggers

Signs you need pool lighting installation

Your light has failed and the fixture is old enough that replacement parts are a hunt
The pool is unusable after dark, which in hot climates removes the most comfortable hours of the day
You have a single dim fixture in a pool that has since gained a spa, a ledge or a deep end it does not reach
Water has got into the fixture, or the lens is fogged, cracked or missing
You are already resurfacing or remodeling, which is the only cheap moment to add or move a niche
You want colour or scene control tied into an automation system you already have

Seeing something not on this list? Browse pools problems by symptom →

The job

How pool lighting installation actually works

Establish what is already in the wall

The niche size and type, the conduit run, the cable and where it terminates dictate what fixtures will physically and electrically fit. This is an inspection, not a catalogue exercise.

Watch for: A fixture ordered from a website before anyone has looked at the niche. Niches are not universal, and a fixture that does not seat properly in one is not an installation you want in your pool.
Choose the fixture and the supply arrangement

Modern pool lighting is predominantly LED, in either line-voltage or low-voltage arrangements, with white or colour-changing options and, on some, control integration.

Watch for: Assuming any LED drops into any niche on any existing wiring. Voltage, transformer requirements and control signalling all have to match what is buried, or the buried part has to change.
Cable, conduit and the junction above the water

The fixture cable runs through conduit from the niche up to a junction point positioned above the water line and clear of the deck, where the connection to the supply is made.

Watch for: Connections made below the required height, or in an enclosure that is not rated for the location. This is exactly the kind of shortcut that looks fine and is the reason the rules exist.
Bonding — the part that makes the pool safe

The niche, the fixture and the metal in and around the pool are connected into the pool's equipotential bonding system so that no dangerous voltage difference can exist across the water and the deck.

Watch for: Bonding described as optional, legacy or someone else's job. Electric shock in a pool is a fatal-risk hazard, this is the system that prevents it, and the requirements are set in electrical code and enforced by inspection. Insist on a licensed electrician.
Protection, testing and inspection

The circuit is protected as required for the location, the installation is tested, and in most jurisdictions it is inspected before the pool goes back into use.

Watch for: No inspection where one is required. It is both a safety issue and something that surfaces awkwardly at sale.
Aiming, sealing and refill

The fixture is seated, sealed as the manufacturer requires, the cable coiled in the niche so it can be pulled out for future service, and the pool refilled.

Watch for: A fixture installed with no service loop of cable in the niche. Without it, the next replacement means draining the pool rather than lifting the fixture out onto the deck.

Money

What does pool lighting installation cost?

Replacing a fixture in an existing niche is a modest job dominated by labour and the electrical connection. Adding a light where no niche exists is a different order of cost entirely, because it means cutting the shell and usually the deck, and is only sensible during a remodel.

See the full pool lighting installation cost guide — by material, size and region →

Straight answer

When pool lighting installation is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

You want a new light where there is no niche and no remodel planned. Creating a niche means cutting the shell and running conduit under a finished deck. Wait and bundle it with a resurfacing or remodel, where the incremental cost is a fraction of doing it alone.
The existing fixture works and you only want colour. Colour-changing LEDs are a genuine improvement, but they are a want rather than a need. If the budget is finite, a cover or a variable-speed pump returns more.
Nobody has confirmed the pool's bonding is intact. If the bonding system is in unknown condition, that is the job — a new light on a pool with compromised bonding is a new fixture on an unresolved hazard. Have it verified first.
You are tempted to fit a fixture you found cheaply online. Pool luminaires are safety-listed equipment for a specific application, and niches are not universal. The saving is not worth an item that does not seat, seal or comply.
The pool is due to be drained soon for other work. Sequence it. Lighting work is far easier and cheaper with the water out, and doing it twice is avoidable.

Your options

Types of pool lighting installation

Pool lights as products

Fixture types, colour and control options.

Pool automation installation

Where lighting scenes and schedules are controlled.

Pool remodeling

The only economical moment to add a niche.

Compare pools options side by side →

Straight answer

Can I do this myself?

Pool lighting is one of the few genuinely lethal DIY temptations in home maintenance. A luminaire is submerged in water that people are standing in, and the bonding and protection arrangements around it are what stop a fault becoming an electrocution. This is licensed, inspected electrical work everywhere in the US. "It is just a bulb" is how people get hurt.

Reasonable to DIY

Identifying the problem: noting whether the fixture is dark, flickering, fogged or has water inside it
Switching the circuit off and leaving the pool out of use until it is looked at
Researching fixture options and colour or control features before speaking to an electrician
Operating scenes and schedules once the system is installed and commissioned

Call a licensed pro

Any work on the fixture, the niche, the cable or the junction — including replacing a lamp or a fixture
All bonding work, and any verification that the pool's bonding is intact
Circuit protection, transformers and control wiring
Cutting a new niche into the shell, which is structural as well as electrical

Before you sign

What to check when hiring for pool lighting installation

Are you a licensed electrician, or is an electrician doing the connection and bonding?

The one non-negotiable question on this page. Pool lighting is inspected electrical work in a fatal-risk location.
Will you verify that the pool's bonding system is intact while you are here?

It is a small addition to a visit that is already happening, and it is the single most valuable safety check available on an older pool.
Does this fixture fit my existing niche, and have you seen the niche?

Niches are not standard. A fixture chosen from a website rather than from the pool is a fitting problem waiting to happen.
Where is the junction point, and does it meet the height and enclosure requirements?

A specific, checkable detail that separates a compliant installation from an improvised one.
Will you leave a service loop of cable in the niche?

It is the difference between the next replacement being done from the deck and being done with the pool drained.
Is this work being inspected, and will I get the paperwork?

Both a safety confirmation and a document you will be glad to have when you sell the house.

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Local pros

Pool Lighting Installation near you

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Related work

Often done at the same time

Pool Remodeling

The cheap moment to add a niche

Pool Automation Installation

Colour scenes and scheduling

Pool Equipment Installation

Where the pad bonding lives

Pool Resurfacing

Bundle lighting while the pool is empty

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FAQ

Pool Lighting Installation — questions people ask

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Can I change a pool light myself?

You should not, and this is one of the few places where the standard internet answer is actively dangerous. A pool luminaire sits in water that people are standing in, and its safety depends on bonding, on correctly rated enclosures, on the junction being at the required height, and on the circuit protection being right. Those are licensed, inspected matters. Even a straightforward-looking fixture swap involves the connection and the niche seal. Call an electrician who works on pools.

Can I add a pool light to an existing pool?

Adding a fixture where a niche and conduit already exist is usually straightforward. Adding one where neither exists is a much bigger job: the shell has to be cut for a niche, conduit run to a compliant junction point, and that route very often passes under finished decking. It is entirely doable, and it is the sort of work that costs a fraction as much if bundled into a resurfacing or a remodel when the pool is already empty and the deck is already open.

Are LED pool lights worth upgrading to?

Generally yes, on two counts. They use substantially less power than the incandescent fixtures they replace, which matters because pool lights run at exactly the hours when nobody wants a big load, and they last longer, which matters a great deal when replacing one is an electrician's visit rather than a bulb change. Colour and scene capability is the bonus rather than the reason. Where an old fixture is failing anyway, the upgrade case is easy.

What is pool bonding and why does it keep coming up?

Bonding connects the metal parts in and around a pool — reinforcement steel, light niches, ladders, handrails, equipment, and sometimes the deck reinforcement — so that they are all at the same electrical potential. That is what prevents a voltage difference existing across the water and the surfaces people touch, which is the mechanism behind pool electrocution. It is a code requirement, it is inspected, and it is frequently disturbed by later work. Any electrician touching your pool should confirm it. See Pools Safety.