LED pool bulbs

You choose a LED pool light bulb by starting from the old one: same format, same base type, same voltage. Note these three details on the removed bulb or in the spotlight's instructions; the colour temperature and the rendering are decided afterwards.

Which LED pool light bulb should you choose for your spotlight?

First note the format, the base and the voltage of the bulb in place: what it replaces defines the purchase. Once these three points are noted, only the light remains to be chosen, warmer for evenings, crisper for swimming, and the pool tiles become readable again as soon as night falls.

Pool lamp bulb: note the format and the socket

Remove the old bulb with the power off and photograph it from two angles, face and base. A screw base of the E27 type, a bayonet, a GU10 socket or a PAR56 block do not take up the same volume in the spotlight niche. Note the diameter of the glass and the available depth: two references can look alike to the eye and not fit in the same way. This photo is also useful to customer service if any doubt remains about compatibility. To compare base families, browse E27 base bulbs and E27 screw base.

Waterproof LED pool spotlight or bulb alone: two different projects

Replacing the bulb in an existing spotlight is a simple job: the fitting, the cable and the power supply are kept. Installing a complete underwater spotlight requires a suitable niche, a cable route and sometimes work in the technical room. If you are renovating the pool, the second option should be considered before the first. If you only want to light the pool again this weekend, stick with the bulb.

Unsure between two product families? The Designix lighting department groups the fittings and their light sources, to compare before ordering.

What wattage of pool light bulb do you need?

Read the value written on the original bulb and on the spotlight plate, then stay within that range. An LED with equivalent output uses fewer watts than the halogen it replaces. The watt describes electrical consumption, the lumen describes the amount of light actually sent into the water.

Pool lighting bulb: compare at equal power

Two references cannot be compared on wattage alone. Look at the output in lumens, the voltage and the base, then check what the spotlight accepts. A spotlight designed for a bulb of a given power will not like a source that exceeds the limit stated by its manufacturer. If the old bulb has faded, the instructions or the spotlight reference will settle it. The rest of the LED bulb range follows the same logic: compatibility first, rendering second.

What happens if you use an LED bulb that is too powerful?

The spotlight heats up more, and the seal and the glass are the first to age. The light can also dazzle swimmers and flatten the contrasts underwater: steps and the bottom are less easy to make out. The value stated by the fitting manufacturer remains the reference not to exceed, without exception.

12 V or 230 V: how do you know at which voltage your pool is lit?

Look for the transformer in the technical room or read the spotlight's rating plate: a pool light bulb is designed for a single voltage. Either 12 V through a transformer, or 230 V connected directly. Always switch off the power at the consumer unit before removing anything.

LED pool lamps: locating the transformer

A box near the technical room, often with cable marking and instructions pinned next to it, is the sign of a low-voltage installation. The absence of a transformer and a cable running directly to the consumer unit point to 230 V. If in doubt, the installation instructions settle it. 12 volt LED bulbs and bulbs designed for 230 V are not interchangeable.

12 V or 230 V pool light bulb: never mix them up

A reference for a different voltage will not light correctly, and may deteriorate. It is not a question of quality but of design: the internal driver is calculated for a precise range. Also check that the transformer delivers a voltage suited to the new bulb before refitting the glass. If the installation is ageing, the low-voltage circuit deserves a check.

What light for the pool: warm white, cool white or colour?

Choose on the rendering, not on the spec sheet: a warm white around 3000 K makes the pool welcoming in the evening and matches the surroundings. A cooler white, around 4000 to 6500 K, gives clearer water and suits swimming pools. Colour models serve the atmosphere of an evening, not everyday light.

3000 K, 4000 K, 6500 K: what it changes underwater

The lower the temperature, the more golden the water looks and the warmer the tiles feel. The higher it goes, the more the blue of the pool stands out and the more marked the contrasts are, which helps to read the steps of a deep pool. The marker to remember: stay consistent from one source to another to avoid a patch of different light on the same wall. For a very soft tint, look at 2700 K warm white light; for a more decisive rendering, 3000 K bulbs.

Multicolour LED spotlight: for what use?

A colour model is chosen for an evening, a birthday, a one-off staging. In everyday lighting, colour tires the eye and makes the pool harder to read. Above all, check that the spotlight accepts dimming: dimmable bulbs do not fit every installation, and a 12 V setup requires a compatible transformer. White bulbs remain the safe choice for regular use.

How do you change the bulb in a pool spotlight?

Switch off the power at the consumer unit, open the spotlight following the instructions, remove the bulb and replace it with a reference of the same format, same base and same voltage. Clean the seal, refit the glass, check the sealing before switching the power back on. A marked seal is replaced, not reused.

Switch off the power and open the spotlight in order

Switch off the dedicated circuit breaker, not just the switch, and wait for it to stop completely. Unscrew the casing or the bezel depending on the model, then hold the glass with one hand while the bulb comes free: the glass is not always attached to the casing. Remove the bulb with the power off, without forcing the base. A stubborn spotlight is reopened with the instructions in front of you, not with a screwdriver.

Seal, glass and reassembly: restoring the sealing

Clean the seal housing, remove limescale deposits and dry before reassembling. A compressed or cracked seal is replaced, otherwise water comes back through the glass. Screw back without forcing, in a cross pattern, to spread the pressure. Then switch the power on and watch the first few minutes. In routine maintenance, rinse the glass with clean water and check the seal each season. For a spotlight recessed into the coping or the pool house, see changing a recessed LED spotlight. Switch off the power at the circuit breaker, remove the fixing spring and note the GU10 base. Then refit the assembly without forcing.

How do you match the pool light with the terrace and the house?

Keep the same colour temperature between the pool, the terrace and the interior: the light stays consistent from one space to another and the evening does not create a break. A warm white around 3000 K works as well on the surroundings as inside the house.

Outdoor bulbs for the surroundings and the pool house

The pool lights, the surroundings guide. Sources in the same tint on the path, the terrace and the pool house avoid the contrast effect between golden water and white steps. Plan low, discreet lighting on the path, and reserve the most powerful source for the water. For the showers and the pool house, outdoor bulbs for the surroundings cover this need.

Extending the same atmosphere indoors

Take up the temperature chosen outside for the living room and the kitchen: the eye moves from the pool to the lounge without a change of tone. This is the basis of a successful modern kitchen decor, where light highlights materials without yellowing them. This temperature consistency matters as much in kitchen decoration as on the terrace. For the living room, a LED chandelier for the lounge completes the set, and the lighting catalogue lets you check the available tints.

How do you decide between two LED pool light bulbs of the same format?

With the same format and voltage, compare the stated ingress protection rating, the quality of the base and the way the bulb is assembled. An affordable model suits a one-off replacement; a more carefully made model is justified for a pool used all year round. Check compatibility before ordering.

What distinguishes an affordable model from a durable one

The crimping of the base, the hold of the glass seal and the stated ingress protection rating make the difference in underwater use. A heated pool used all year round puts more demand on the source than a pool open in summer. Also look at the availability of the same reference during the year: recovering the same rendering on a second replacement avoids a difference in tint on the wall. Browse our selection of bulbs to compare the families.

Checking compatibility before ordering

A photo of the old bulb, the spotlight reference and the stated voltage are enough for customer service to confirm the model. Do not order on an impression of similarity: a slightly different diameter blocks the refitting of the glass. The 230 V circuit and the low-voltage setup remain the only two cases to identify.

• Secure payment on the Designix shop.
• Tracked delivery, parcel to be received and checked.
• Returns possible according to the shop's conditions.
• Designix customer service available to confirm a format.

Unsure about the reference to choose? Send the photo of your removed bulb via customer service, or start again from all the light fittings to locate your spotlight.

Frequently asked questions