Nothing dates a pool like a dead light — and nothing modernises one faster than a crisp LED glowing at dusk. The move from old halogen fittings to LED pool lights is one of the most satisfying small upgrades in pool ownership, but the light niche is also where electricity meets water, which makes it the one upgrade where corner-cutting is genuinely dangerous. Here is the full picture.
Why LED pool lights won
- Power: an LED delivers the light of a 300W halogen for a tenth of the electricity — it can run all evening for cents;
- Lifespan: tens of thousands of hours against a halogen’s single season or two;
- Heat: LEDs run cool, which is kinder to seals and housings — the components that actually fail;
- Colour: modern fittings do white through full RGB scenes from a remote or app.
LED pool light quick facts:
- Retrofit LED bulbs/fittings for existing niches: ± R800 – R3,500
- Full new fitting, professionally installed: ± R2,500 – R6,000
- All pool lighting must run on 12V via a transformer — never mains at the niche
- A flooding light niche is also a leak point — fix both together
What goes wrong with pool lights
- Flooded fittings: the lens gasket perishes, water reaches the lamp, and the light dies — or trips the earth-leakage the moment it switches on. The fix is a new fitting or gasket done properly, not silicone smeared over hope.
- Corroded cabling: coastal air wicks into old cable joints; symptoms range from flicker to nuisance tripping.
- Dead transformers: the 12V supply in the DB or garden box fails — often misdiagnosed as a dead light.
- Leaking niches: the housing behind the light is a classic slow-leak point on older pools — if your pool loses water AND the light has a history, mention both when booking; our leak detection dye-tests the niche as standard.
Replacement done properly
A professional swap covers: power isolated and verified; old fitting out with the niche inspected for cracks and corrosion; new LED sealed and seated; cable run checked back to the transformer; earth-leakage protection confirmed working. Most swaps happen without draining — decent fittings service from the front with the lamp brought up onto the coping. It is quick work for someone who does it weekly, and it is on the standard menu of our Cape Town pool repairs.
Upgrading during bigger work
The smartest time to modernise lighting is when the pool is already empty for resurfacing — niches can be repaired or replaced, cabling renewed, and a second light added on larger pools, all without a separate call-out. If a reline is in your future anyway, plan the lights into it; we quote them together on request at any free assessment.
Frequently asked questions
My pool light trips the electricity when I switch it on. Dangerous?
The trip is the safety system doing its job — almost always water in the fitting or cable. Leave it off and have it repaired; do not bypass anything.
Can I just put an LED bulb in my old halogen fitting?
Often yes — retrofit lamps exist for common niches — provided the fitting is dry, sound and correctly sealed on reassembly. A flooded or corroded fitting needs replacing first.
Do LED pool lights need special transformers?
They draw far less power, but supply must match the lamp’s spec (12V AC/DC as designed). Mismatched supplies are a common cause of early LED death.
How many lights does a pool need?
Small pools: one good LED. From about 8m, two lights kill the dark corners — worth doing while the pool is empty for other work.
