Red Light Therapy vs. Infrared Saunas: What’s the Difference?
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Time to read 5 min
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Time to read 5 min
LED-SCIENCE [10-21-2025]
BY MADISON CARTER
At-home wellness tech has exploded in the past few years, and two options keep showing up everywhere: red light therapy and infrared saunas. They sound similar because both use light on the body, but they’re not interchangeable. One is designed to energize your cells for repair and skin renewal, while the other uses heat to promote sweating, circulation, and full-body relaxation.
If you’re deciding between the two, the most important thing is this: they work through different mechanisms and deliver different results. This guide breaks down how each treatment functions, what benefits you can realistically expect, and how to choose the right one based on your skin and wellness goals.
Red light therapy (also called photobiomodulation) uses specific wavelengths of red and near-infrared light, commonly in the 630–850 nm range, to deliver low-level energy into the skin. Instead of heating tissue, this light is absorbed by mitochondria inside your cells, helping them produce more ATP (adenosine triphosphate). ATP is essentially cellular fuel, and more of it means better repair, faster recovery, and stronger skin function.
Because the treatment is non-thermal, it’s extremely gentle. It supports natural collagen production, reduces oxidative stress, and helps balance inflammatory signals in the skin. Over time, this can make a visible difference in texture, redness, and overall firmness, especially for sensitive, aging or acne-prone skin.
Another advantage is precision. Red light therapy can be applied to specific areas including the face, neck, chest, scalp, joints, or localized pain spots, so it’s easy to target the exact concern you want to improve. This makes it a popular choice for people focused on skin rejuvenation, post-procedural healing, chronic redness, or recovery from workouts and inflammation.
Infrared saunas use infrared wavelengths to warm the body directly, rather than heating the surrounding air like a traditional sauna. This deeper, more penetrating heat raises your core temperature gradually, which triggers sweating and a strong circulation response. In practice, that means your body gets the benefits of a sauna session at a lower ambient temperature, often with a more comfortable experience.
The main mechanism here is thermal stress. As your internal temperature rises, your blood vessels dilate, your heart rate increases similar to light cardio, and your body begins to sweat heavily. That sweat response supports detoxification through the skin and can leave you feeling looser, calmer, and more recovered, especially for muscle soreness or tension.
People often use Infrared saunas to unwind after long days, support circulation, help sleep quality, or ease stiff joints. While they can improve skin appearance indirectly through better blood flow, they’re not designed to stimulate collagen or cellular repair in the same direct way red light therapy does.
Although both treatments sit within the broader light spectrum conversation, the real difference comes down to energy vs. heat and targeted vs. systemic benefits.
Red light therapy delivers low-level light energy that improves how cells function. The result is more efficient repair, reduced inflammation, and better skin resilience. It’s specific, localized, and cumulative, meaning the more consistent you are, the more noticeable the long-term improvements become.
Infrared saunas deliver heat to trigger a physiological response. The results are systemic: circulation increases across the body, muscles relax, and sweating helps the detox process. The effects are often felt right away (relaxation, loosened muscles), but they’re less targeted for specific skin or tissue concerns.
Quick comparison:
You can, but it depends on what you want out of your routine. Red light therapy fits naturally into a daily schedule because it’s quick, gentle, and supports ongoing skin and recovery goals without needing heat or long sessions. An infrared sauna can still pair well with it, but more as an occasional deeper unwind for relaxation and circulation, not something most people use every day.
If you choose to combine them, many prefer doing sauna sessions on select days for the full-body reset, then relying on red light therapy throughout the week for steady skin and recovery support. Because they work in different ways, they don’t overlap, you just want to space sessions based on comfort, especially with heat.
Most people ultimately choose based on what they want to treat, and red light therapy often ends up being the more practical choice for daily use. It delivers targeted skin improvements, supports steady recovery, and fits easily into a short routine without the heat, space, or setup that saunas require. Infrared saunas still have a clear role for deep relaxation and detox, but they’re more of a full-body wellness session than a targeted skin treatment.
If you’re deciding between the two, especially when thinking about long-term skin goals or budget, red light therapy is the more efficient starting point. With options ranging from full-body devices that treat large areas (similar to infrared saunas) to LED masks and targeted tools for precise treatment, it offers a flexible, high-impact routine that’s easy to maintain at home. The right device can support visible skin improvements and recovery benefits in a way that’s consistent, accessible, and sustainable long term.
Both red light therapy and infrared sauna therapy are considered safe for most people, but they work in different ways, so the safety experience isn’t identical. Red light therapy is non-thermal, meaning it doesn’t raise core body temperature, which makes it a gentler option for sensitive, redness-prone, or inflammation-prone skin. Using a reputable, clinically tested or FDA-cleared device and sticking to recommended session times keeps risk low and results consistent.
Key safety tips to remember:
Infrared saunas are also safe when used correctly, but because they rely on deep heat, it’s best to ease in if you’re heat-sensitive or new to sauna therapy. Start with shorter sessions, listen to how your body responds, and build up gradually. If you’re pregnant, taking photosensitizing medications, or managing conditions that affect circulation or temperature regulation, check with a healthcare professional before starting either red light therapy or infrared sauna use.