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You already own a sauna. You want red light in it. The obvious move — hang a normal red light panel on the wall — is also the one that will destroy the panel, and possibly your sauna's electrics.
This is the question we get asked more than almost any other, and it is very badly served online. Most articles compare red light therapy and infrared saunas as competing modalities, which is not what anyone standing in their own sauna actually wants to know. The real questions are practical: will it survive the heat, where does the power come from, and does my sauna already do this?
Here are the answers, in the order you will need them.
Before you buy anything
- A standard red light panel is not rated for sauna heat and humidity. Use one built for it.
- Your infrared sauna almost certainly does not already give you red light therapy. Near-infrared heaters and 660nm LEDs are different things.
- Most saunas have no internal power socket. Plan the cable route before you plan the mounting.
- Any electrical work in or through a sauna cabin is a job for a qualified electrician, not a Sunday afternoon.
Does my sauna already have red light therapy?
Start here, because a lot of people are about to buy something they may not need — and a lot of others believe they already have something they do not.
If your infrared sauna's spec sheet mentions "near-infrared" or "full spectrum", that refers to its heaters. Those emit infrared energy whose job is to warm you. That is not the same as an LED array emitting a specific, controlled dose at 660nm red and 850nm near-infrared.
The quickest test: look at it. A red light therapy array looks like rows of individual LED diodes and glows deep red. A near-infrared sauna heater looks like a lamp or an emitter panel and produces heat you feel immediately. If you can comfortably keep your hand near it and it is not warming you, it is light. If it is warming you, it is a heater.
A handful of saunas do include genuine LED arrays. If yours has a small panel of visible red diodes with its own switch, you already have it. Check your manual for a wavelength figure in nanometres — if there is a number like 660nm on the page, that is an LED array, not a heater.
Why a normal panel will not survive
A traditional sauna runs at 70–100°C. Even a gentle infrared cabin sits at 45–60°C, and steam rooms add near-total humidity on top. A standard red light panel is designed for a bedroom or gym at 20°C.
Three things go wrong:
- The LEDs lose output. LED efficiency falls as junction temperature rises. A panel that cannot dump its heat gets dimmer, and the damage is cumulative.
- Cooling fans fail. Most panels rely on fans that were never specified for a 90°C ambient. When the fan dies, the panel cooks itself.
- Moisture gets in. Standard panels have vented housings. Steam and condensation reach the driver and the solder joints, which is an electrical safety problem, not just a warranty one.
A sauna-rated panel is built differently: sealed against moisture, passively cooled or fan-free, and specified for a stated maximum ambient temperature. The bodybud™ MEGA 9-Wave Sauna Light Panel (£895) is our panel designed for heat-friendly spaces.
Always check the numbers against your cabin. Before ordering any panel for a sauna, ask the seller for the maximum rated ambient temperature and the ingress protection (IP) rating, and compare them with how hot your sauna actually runs. If a seller cannot give you both figures, that is your answer. Ask us for the current spec sheet and tell us your cabin type — we would rather talk you out of the wrong panel than process a return.
Where does the power come from?
This is the question that stops most installations, and almost nobody writes about it. Sauna cabins are deliberately built without internal mains sockets. You have three realistic options.
On battery or wireless panels: the power draw of a meaningful LED array makes a genuinely cordless full-size sauna panel impractical. Be sceptical of anything advertised that way.
Outdoor and barrel saunas
Barrel saunas bring two extra problems. The curved wall means a flat panel will not sit flush — you will need a bracket or a purpose-made mount, and you should plan for the panel to sit above or beside the bench rather than behind your back.
The second is that an outdoor cabin goes through freezing nights as well as hot sessions, plus condensation every time it cools. That thermal cycling is harder on electronics than the heat itself. For outdoor installations we would strongly favour a permanently wired, properly sealed setup done by an electrician over anything improvised.
Mounting: where to actually put it
- Not above the heater. The hottest air in the cabin rises directly off it. Mount on a side wall or the wall opposite.
- At the height you sit, not the height you stand. You will be on a bench. Aim the panel at torso height from a seated position.
- Fix into the frame, not just the cladding. Sauna cladding is thin softwood. Find the batten behind it.
- Leave an air gap behind the panel. Even a passively cooled unit needs somewhere for heat to go.
- Do not block a vent. Sauna ventilation is designed, not incidental.
Should you use them together, or separately?
There is no strong evidence establishing a single correct order, and anyone telling you otherwise is overstating what is known. What we can say practically: heat makes people want to keep sessions short, so if you are combining them, keep your light session within your comfortable sauna time rather than extending your sauna to fit the light.
Plenty of people prefer to keep them separate entirely — sauna in the evening, light in the morning — precisely because it lets each one run for as long as suits it. If you have the space for a standard panel outside the cabin, that is often the easier setup and the cheaper panel.
Quick answers
Can I put a red light panel in a steam room?
Only with a panel explicitly rated for near-100% humidity, and we would want a proper IP rating in writing. Steam rooms are harder on electronics than dry saunas.
Will the panel make my sauna hotter?
Marginally. A few hundred watts is small next to a sauna heater. It will not meaningfully change your session temperature.
Do I need a different panel for an infrared cabin than a traditional sauna?
Possibly. Infrared cabins run cooler (typically 45–60°C) so the thermal requirement is less severe. Traditional saunas at 80°C+ need the higher rating. Tell us which you have and we will match it.
Is it worth it, or should I just buy a sauna blanket?
Different jobs. A sauna blanket heats you. A red light device delivers light. If you already own a sauna you have the heat covered — what you are adding is the light. A red light blanket is the alternative worth comparing, and it needs no installation at all.
Send us your cabin details
Tell us the make, the internal dimensions and how hot you run it, and we will tell you which panel fits and how to get power to it — or whether mounting outside the glass is the smarter option.
This article covers product selection and installation practicalities only. It is not medical advice and nothing here is intended to diagnose, treat, cure or prevent any condition. Electrical work in or around a sauna should be carried out by a qualified, registered electrician. If you have a health condition or are unsure whether sauna use or light therapy is appropriate for you, speak to a qualified healthcare professional first.