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Spa Lighting Design: Light for a Guest Who Is Lying Down

Archlior
Spa Lighting Design: Light for a Guest Who Is Lying Down

Most rooms are lit for people who stand or sit. A spa treatment room is lit for someone lying on their back for an hour, or face down looking at a small patch of floor, while the person working on them stands. The surface the guest looks at longest is the one most lighting plans treat as a service zone: the ceiling. Good spa lighting design starts from that bed, not from the doorway.

None of this is new. Hospital lighting guidance recognises that a patient lying in bed looks upward, and that overhead lights are the ones most likely to glare. This guide applies that lesson to spas, room by room, and sets out the rules that still apply when the lights go down: a commercial spa is a workplace, its showers are special locations, and its dimmest rooms and corridors can still be on escape routes.

Spa Lighting Design Starts at the Treatment Bed

The Light and Health Research Center at the Icahn School of Medicine at Mount Sinai, in its 2022 guidance on patient rooms, notes that overhead luminaires have "the highest likelihood of being perceived as glaring, especially when the patient is in the reclined position", looking upward. It recommends "well-shielded luminaires or luminaires with large-aperture, low-luminance lenses/diffusers", and suggests reducing the contrast between the overhead lighting and its surroundings.

A spa is not a hospital, but the geometry is the same. In our view, it leads to three rules for a treatment room:

  • Keep the ceiling above the bed clear. No downlights, spots or bright diffusers in the zone a reclining guest can see. Put the light on the walls instead.
  • Keep the ceiling dim and even. A cove that floods the ceiling turns it into the brightest surface in the guest's view. Use it gently, or light the walls from a slot at the wall head so the ceiling stays a soft, quiet plane. Our guide to cove lighting covers how to get an even, hidden cove.
  • Remember the face cradle. Face down, the guest sees only the floor below the bed. A bright source under the bed or on that patch of floor is the face-down version of a downlight overhead.

Test it as the guest will: lie on the bed at the mock-up, face up and face down, before the ceiling is boarded.

The Layers of a Treatment Room

Ambient: walls, not ceilings

Light grazing down a textured plaster or stone wall gives the room its glow without putting a source in view. A low-level slot or plinth light adds a sense of floor without lighting the guest's eyes.

Task light for the therapist

The therapist needs to see skin, product and hands, and for facials needs good colour rendering. Specify an adjustable task light that can be aimed at the work and away from the guest's eyes, at CRI 90 or above with R9 above 50, the same standard we use at a bathroom mirror for skin tones. Our salon lighting guide makes the same point for clients reclined at the basin: keep bright sources out of their eyeline and give staff separate task light.

Scenes and controls

A treatment room changes job several times an hour. In our view it needs four scenes:

  • Consultation: brighter, with light on faces, so therapist and guest can talk and assess skin.
  • Treatment: low, warm and indirect, with the ceiling dark.
  • Wake: a slow fade back up, so the end of the treatment does not arrive as a flash of light.
  • Clean: full output, for housekeeping between guests.

Put the control where the therapist stands, within reach of the head of the bed, so changing a scene never means leaving the guest. Deep dimming is where poorly matched dimmers and drivers flicker; our guide to dimming and lighting controls explains what to specify.

In our view, keep one warm colour temperature across the room, around 2700K. If the brief includes colour-changing light, make sure it can also produce a good warm white.

Relaxation Rooms and Corridors: Dark Is Not the Same as Unsafe

The atmosphere of a spa depends on low light, and relaxation loungers put guests in the same reclined position as the treatment bed, so the same rule applies: nothing bright overhead. The law, though, sets a floor under the darkness. In Great Britain, regulation 8 of the Workplace (Health, Safety and Welfare) Regulations 1992 says: "Every workplace shall have suitable and sufficient lighting." The regulations exclude domestic premises, but a commercial spa is a workplace for every therapist and attendant who walks its corridors in the dark.

The HSE's guidance, Lighting at work (HSG38, second edition), turns that into figures. It recommends an average of 20 lux, with a minimum of 5 lux, for corridors and circulation routes where only movement is involved, and says its recommendations "should provide the minimum light levels necessary for the health and safety of employees". The guidance is not compulsory, but HSE says that following it will normally be enough to comply with the law, and inspectors may refer to it as good practice.

HSG38 also limits the step between spaces. Where two working areas lit to different levels are separated by a barrier, such as a wall with a doorway, but there is frequent movement between them, it gives a maximum illuminance ratio of 10:1; for adjacent areas with no barrier, the maximum is 5:1. Its worked example is a 500 lux interior next to a separate area used only for movement: that area should be lit to at least 50 lux near the doorway, and can fall to 20 lux further away. In a spa, that is the walk from a bright reception desk into a dim relaxation room. Our view: step the light down in stages, so the guest's eyes adjust on the way rather than at the door. Our guide to hallway and corridor lighting covers the same principle at home.

Floors need care. The HSE warns that "too much light on a shiny floor can cause glare and stop people from seeing hazards on the floor and stairs", and that too little light does the same. In our view, wet, polished stone under downlights risks both. Honed or textured finishes, with low-level light that grazes the floor rather than bouncing off it, help keep bare feet safe and the room calm.

Wet Areas: Showers, Pools and Thermal Rooms

Showers are special locations under BS 7671, the UK wiring regulations. SELECT's pocket guide to Section 701 sets out the zones: equipment in zone 1, above a bath or shower basin to 2.25 m from the floor (or to the highest fixed shower head, if higher), needs at least IPX4, and in zone 0 it needs at least IPX7 and must be fed from a SELV source of no more than 12 V AC or 30 V DC, installed outside the zones. For a shower with no basin, zone 1 extends 1.20 m horizontally from the centre point of the fixed water outlet. All low voltage circuits serving the location, and any passing through zone 1 or zone 2 without serving it, need additional protection from 30 mA RCDs. The guide is based on BS 7671:2018+A2:2022, which predates Amendments 3 (2024) and 4 (2026); BSI set 15 October 2026 as the withdrawal date for the previous version, so confirm the current requirements with your electrician. Our bathroom lighting guide explains the zones in more detail.

Saunas, steam rooms and pools each have their own constraints. Our guides to sauna and steam room lighting and swimming pool lighting cover them, including keeping drivers outside hot rooms.

In our view, an experience shower should light the water and the wall it runs down, not the bather's eyes.

How It Changes by Project Type

Hotel spas. Guests often arrive in robes from their rooms, sometimes late in the evening, so the spa entrance should feel like a continuation of the hotel corridor rather than a bright threshold. Our guide to hotel guest room lighting covers the rooms they come from.

Day spas. Guests walk in from the street, often in daylight. That makes the reception the transition zone and, in our view, the step down from daylight to treatment room the longest in any spa.

Home spas and residents' amenities. In England, Part P of the Building Regulations covers electrical installations in dwellings. Under the Building Regulations, as Approved Document P (2013 edition) explains, installing a new circuit is notifiable, along with any addition or alteration to existing circuits in a special location, which includes a room containing a swimming pool or sauna heater and the space around a bath tap or shower head. Approved Document P also lists shared amenities of blocks of flats, such as laundries and gymnasiums, within the scope of Part P, so check how a residents' spa will be treated.

Changing Rooms and Vanities

Guests leave a spa through a mirror. After an hour in low light, they will judge their skin and hair under whatever light is at the vanity. Put light either side of the mirror at face height, as our bathroom guide recommends, with CRI 90 or above and R9 above 50. Make the changing room brighter than the relaxation rooms, but reach it through a transition, not a jump.

For Architects: Rules and Coordination

The rules are few, but in the jurisdictions named below they apply to every commercial spa, however softly lit. The Workplace Regulations exclude domestic premises, so a private home spa is a different case.

  • Workplace lighting: regulation 8 of the Workplace Regulations 1992 (Great Britain) requires suitable and sufficient lighting, and emergency lighting in any room where people at work are specially exposed to danger if the artificial lighting fails.
  • Fire safety: in England and Wales, article 14 of the Regulatory Reform (Fire Safety) Order 2005 requires emergency routes and exits that need illumination to have emergency lighting of adequate intensity if the normal lighting fails. Where dark relaxation rooms and treatment corridors are on an emergency route, a low normal lighting level does not change this; agree the emergency lighting design with the fire engineer.
  • Electrical: rooms containing a bath or shower are special locations under BS 7671 Section 701, and pools and rooms with sauna heaters have their own sections. Ask the electrician which requirements apply to a steam room. All electrical work should be carried out by a suitably qualified electrician.

Coordination points that get missed:

  • Fix treatment bed positions before the reflected ceiling plan, so nothing lands above a guest's face.
  • Put scene controls at the head of each bed, not by the door.
  • Keep drivers and controllers outside wet and hot rooms, with access for maintenance.
  • Specify floor finishes with the lighting designer, not after.
  • Mock up one treatment room and test it lying down.

Checklist

Treatment rooms

  • No downlights or bright diffusers in the ceiling zone above the bed
  • Walls grazed or washed from concealed sources; ceiling kept soft and dim
  • Nothing bright on the floor below the face cradle
  • Adjustable task light, CRI 90 or above, R9 above 50
  • Consultation, treatment, wake and clean scenes, controlled from the bed

Circulation and relaxation

  • At least the HSG38 minimums on staff routes
  • Light stepped down in stages from reception, within HSG38's maximum ratios
  • Honed or textured floors with low-level grazing light

Wet areas and safety

  • IP ratings and SELV agreed with the electrician for every zone
  • Drivers outside hot and wet rooms
  • Emergency lighting agreed with the fire engineer

Five Mistakes

  1. A downlight grid over the bed. The guest spends the hour looking straight into it.
  2. Lighting the ceiling to look calm. A brightly lit ceiling is the brightest thing in a reclining guest's view.
  3. Dark corridors with no minimum. In Great Britain, atmosphere does not remove the legal duty to light a workplace.
  4. A bright reception opening straight into a dim room. Step the levels down so eyes can adjust.
  5. Controls by the door. The therapist should never have to leave the guest to change the light.

Frequently Asked Questions

What is the best lighting for a spa treatment room? Low, warm, indirect light from the walls, nothing bright in the ceiling above the bed, an adjustable task light for the therapist, and scenes for consultation, treatment, waking and cleaning.

What colour temperature is best for spa lighting? We use around 2700K throughout, kept consistent within each room. If colour-changing light is part of the brief, make sure it can also produce a good warm white.

Should there be downlights above a massage table? In our view, no. Patient room guidance from the Light and Health Research Center notes that overhead luminaires have "the highest likelihood of being perceived as glaring, especially when the patient is in the reclined position", and a spa guest spends much of a treatment looking up.

How bright should a spa corridor be? In Great Britain, HSE guidance HSG38 recommends an average of 20 lux, with a minimum of 5 lux, on routes used only for movement. Where a wall with a doorway separates the route from a much brighter area and people pass between them often, light the route near the doorway to at least a tenth of that level: 50 lux beside a 500 lux room, in HSG38's example. Where there is no barrier between them, HSG38's maximum ratio is 5:1, so light the route to at least a fifth.

Do spa showers need special light fittings? Yes. Under BS 7671 Section 701, fittings in the shower zones need minimum IP ratings, and zone 0 also needs SELV. Agree every fitting with your electrician.

Does a spa need emergency lighting? In England and Wales, article 14 of the Fire Safety Order requires emergency routes and exits that need illumination to have emergency lighting of adequate intensity if their normal lighting fails. A deliberately dim scheme does not change that.

More on Spa Lighting

Notice

This article is published by Archlior for general information and educational purposes. It is written for architects, interior designers and homeowners as an introduction to spa lighting design.

It is not professional lighting design advice, or a statement of compliance with health and safety, fire safety or wiring regulations for any project.

Regulatory guidance is summarised from the sources listed and may change; check the current regulations, HSE guidance and BS 7671, and consult the fire engineer and building control for your project. The sections on placing light describe design practice, not rules.

All mains electrical work should be carried out by a suitably qualified electrician working to the regulations in force locally.

Archlior accepts no liability for any loss, cost or damage arising from reliance on the information in this article. Readers act on it at their own discretion.

Last reviewed: October 2026.

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