Red Light Therapy vs Infrared Sauna: What's the Difference?

Walk into any wellness space these days and you'll find both red light panels and infrared saunas being talked about in the same breath. They're often lumped together — sometimes even confused for the same thing — but they work in genuinely different ways, and understanding that difference makes it much easier to know which one (or both) belongs in your routine.

The Short Answer

Red light therapy uses light. Infrared saunas use heat. That's the fundamental split, and almost everything else follows from it.

Red light panels emit specific wavelengths of red and near-infrared light that interact with your cells directly, without warming your body. Infrared saunas, on the other hand, use infrared radiation to heat you from the inside out, raising your core temperature much like a workout would.

How Red Light Therapy Works

Red light therapy — or photobiomodulation — uses light in the roughly 600–1,100nm range to reach cells at different depths depending on wavelength. Shorter red wavelengths (around 630–670nm) work primarily at the skin's surface, supporting collagen production and skin tone. Longer near-infrared wavelengths (800nm and beyond) reach deeper into muscle and joint tissue.

Because there's no significant heat involved, sessions are typically short — often 10–15 minutes — and you can target a specific area, like a joint or a patch of skin, rather than treating your whole body at once.

How Infrared Saunas Work

Infrared saunas also use infrared wavelengths, but at the much longer far-infrared end of the spectrum — generally 1,000nm and up. Instead of targeting cells the way red light does, this energy is absorbed by the body and converted into heat, raising your skin and core temperature directly rather than heating the air around you the way a traditional sauna does.

This is where the sweating, the elevated heart rate, and the whole-body relaxation response come from. It's a heat therapy first, and a light therapy second.

Where the Benefits Diverge

Red light therapy tends to be the tool people reach for when they want something targeted — a knee that's been aching, a skin concern, a faster bounce-back after training. Infrared saunas tend to be the tool people reach for when they want a whole-body reset — the kind of session that leaves you loose, sweaty, and calm.

There's also a growing body of research suggesting the two may work well as a complement to each other rather than a competition — using red light for targeted cellular support and infrared heat for broader circulation and relaxation.

Which One Should You Choose?

Honestly, it depends on what you're solving for:

• Choose red light therapy if you want a quick, targeted daily habit — something you can fit into a morning routine, use on a specific area, and do without breaking a sweat.
• Choose an infrared sauna if you want a longer, whole-body relaxation ritual and don't mind the time commitment or the heat.
• Consider both if your goals span everything from skin health to stress relief — many people build a routine around red light in the morning and sauna sessions a few times a week.

The Bottom Line

Neither technology is "better" in an absolute sense — they're solving different problems. Red light therapy is precise, quick, and cellular. Infrared saunas are immersive, whole-body, and heat-driven. The right one for you comes down to what you're actually trying to achieve, and how much time you want to spend getting there.

Curious what targeted red light therapy actually feels like? Explore Magma's panels here to see how a few minutes a day fits into a real routine.