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Pool Light Colour Temperature Choices

Pool water is a filter, a mirror and a mood at once, and colour temperature is the cheapest design variable in the whole installation — it costs nothing to choose, and it is chosen for the life of the fitting. The Lesan models span 2200K to 6500K plus RGBW; here is how those options map to real pool decisions.

What colour temperature does to water

Water absorbs the red end of the spectrum first, so a light that looks warm at the fitting looks cooler by the time it crosses a pool. A 2200K source — the warm end of the span, candlelight territory — arrives amber and intimate, and suits a small residential pool or a spa where the water is part of an evening room. Around 3000K the water reads natural and welcoming, the default of most hotel pools. At 4000K the blue of the water itself starts to dominate and the pool reads crisp and architectural. Towards 6500K the effect is daylight-bright and clinical: excellent for lane swimming visibility, harsh for a leisure basin at midnight. The efficacy figures follow the same physics in reverse — the highest efficacy comes at 6500K (>90 lm/W) and lower figures at warmer temperatures — so the coolest choice is also, on paper, the most efficient one. Design rarely follows that paper logic; atmosphere wins, and should.

CRI: the quiet specification

Colour rendering decides how skin, mosaic tile and planting look under the light. The underwater models carry CRI Ra≥80 as their standard, with the LX-UD005 offering steps of Ra≥70, Ra≥80 and Ra≥90 by variant. For a pool whose tile work is the design feature — deep blue glass mosaic, stone coping, coloured grout — the higher-CRI variant earns its place. For a competition pool where the brief is visibility and uniformity, standard CRI with the right temperature is the rational buy. CRI is a variant choice, so it belongs in the inquiry, not in a remark after delivery.

When RGBW earns its complexity

RGBW adds a colour estate to the pool: scenes for events, a resort's evening identity, a private pool that changes character between a morning swim and a dinner party. The cost is a control system — DMX512 sequencing, addressing, a controller — and fittings ordered in their colour variant. The LX-SC009, engineered for fountains, pools and water features, is the range's pool-shaped colour candidate, with mixed-colour output up to 24W. The honest question is frequency: a pool that runs a colour scene twice a year is paying system money for a party trick, while a leisure resort running scenes nightly is buying its signature. If the answer is uncertain, the middle route is a white installation with the cabling and control provision made for a later colour refit — but the fittings themselves cannot be upgraded in place, because colour is a shipped configuration.

Matching the choice to the model

All four underwater models cover the 2200K-6500K span; three of them add RGBW. The wall-facing choice is therefore less about which model can produce a temperature and more about size, impact rating and control: the LX-SC009 in three sizes for a pool wall, the LX-UD-001A at 3W for spa niches and steps, the LX-UD005 where a fountain basin adjoins the pool. Control follows the programme: static white can run on-off; scenes need the DMX512 or DALI variants available. Write the temperature, the CRI step and the control method into the inquiry as three separate lines — they are three separate variant decisions that happen to travel together.

The pool category and its model sit under LED swimming pool lights, and the full submersible range is under LED underwater lights.

Two pools, two right answers

Take a rooftop leisure pool above a city hotel: glass towers around it, dinner service at one end, the water as a mirror for the skyline. The design conversation there ends warm — the low end of the span, high CRI, the pool as a lantern among towers — because the pool's job is atmosphere and the swimmers are an audience of diners. Now take the municipal training pool across town: lanes, clubs, early mornings, coaches reading stroke technique from the deck. That conversation ends cool and bright, standard CRI, uniformity over mood, because the water's job is visibility. Same product range, same temperature span, opposite ends of it — and both decisions correct, because colour temperature is not a specification to maximise but a fit to argue from the water's actual work.

The reflection nobody specifies

Half of what a pool light does happens above the surface: the lit water throws a moving reflection onto ceilings, walls and the underside of bridges and canopies. Warm sources throw amber caustics that read as firelight; cool sources throw the silver shimmer of moonlight on water. Designers who mock up a pool at night look up as much as down — the reflection is often the larger lit surface in the room. It is also where a colour programme proves itself or embarrasses itself: a slow RGBW crossfade reflected across a ceiling is a room-sized artwork, while the same programme at double speed is a disco the architect never ordered. Specify the scene pace when you specify the colour; the fittings will faithfully execute either.

A note on mixing temperatures

Renovations inherit fittings: part of a pool relit this year, part surviving from the last decade. Mixing colour temperatures in one body of water is the one unforced error this subject offers — the water shows the seam between two whites more honestly than any other surface in architecture. If a phased relight is unavoidable, phase by zone with a real boundary (main pool now, spa later) rather than by alternate fittings, and record the surviving fittings' temperature in the site file so the second phase can match or deliberately replace. The consistent 2200K-6500K span across the range exists precisely so a family chosen today can be extended tomorrow without a seam.

Testing the choice before it is plumbed in

Colour temperature is hard to un-choose, but it is not hard to preview. A single fitting of the shortlisted model, run at night in the actual water — or in a test tank at the supplier's end with the pool's tile sample behind it — settles more than any rendering. Tiles lie under showroom light; water over the real tile at the real depth tells the truth about warmth, CRI and mood in one look. If a site visit is impossible, ask for the choice to be recorded against reference photographs of comparable water, and keep the temperature decision in the same document as the model decision, so a later value-engineering round cannot silently trade one for the other.