Red light therapy panels, with the dosing arithmetic nobody prints on the box
Panels, wavelengths and the dose maths every brand skips — including why the irradiance figure on the box is usually not the one reaching your skin.
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- ~30× search growth in 3 years US demand for red light panels. The number of brands publishing a defensible irradiance figure has not grown at all.
- J/cm² = mW/cm² × s ÷ 1,000 The arithmetic that makes the category legible. Most published protocols land between 10 and 60 J/cm².
- 70 mW/cm² at 6in → 42 J/cm² Ten minutes at that irradiance sits right in the band. The same panel at twelve inches delivers roughly a quarter of it.
- Measured with what? A $30 solar meter substantially over-reads narrow-band red and near-infrared. Where a brand quotes both, the honest figure is the smaller one.
Red light is the fastest-growing corner of home recovery, and the one with the widest gap between marketing and measurement. US search demand for red light panels has grown roughly thirty-fold in three years. The number of brands publishing a defensible irradiance figure has not grown at all.
Here is the arithmetic that makes the category legible. Dose in joules per square centimetre equals irradiance in milliwatts per square centimetre times seconds, divided by one thousand. Most published protocols land between 10 and 60 J/cm². So a panel genuinely delivering 70 mW/cm² at six inches gives you about 42 J/cm² in ten minutes — right in the band. The same panel at twelve inches delivers roughly a quarter of that, because irradiance falls off fast with distance.
Which is why the single most useful question to ask a red light brand is not "how many watts" but "measured with what, at what distance". A consumer solar meter — the $30 device most brands and most reviewers use — substantially over-reads narrow-band red and near-infrared. When a brand publishes both a meter number and a spectroradiometer number, the honest one is the smaller one.
The head-to-head comparisons put two panels' irradiance figures in the same table with the distance and the instrument each was quoted at, which is the only way those numbers can be read against each other.
The decisions this section settles
- Is the irradiance number real?
- Usually not, as stated. Most brands quote consumer solar-meter readings, which over-read red and near-infrared LEDs substantially. Mito publishes both meter and spectroradiometer figures, and the gap is roughly 2×.
- How big a panel?
- Panel size sets session length, not effectiveness. A 10 x 14 inch panel treats a knee; treating a back with it means four repositions. Buy the size that matches the body area you actually care about.
- Which wavelengths?
- 660nm for skin and superficial tissue, 810–850nm for deeper penetration. Extra wavelengths like 590nm and 830nm are plausible additions, not proven necessities.
- How long per session?
- Dose is irradiance times time. At a genuine 70 mW/cm² at six inches, ten minutes delivers about 42 J/cm² — inside the commonly cited 10–60 J/cm² band. Double the distance and you need roughly four times the time.
- Single, dual or quad chip?
- More chips per LED package means more optical power per unit area, which is why quad-chip panels cost more and run hotter. It is the clearest spec-to-price relationship in the category.
- Is any of this FDA cleared?
- Several devices carry Class II clearances for specific indications like temporary pain relief. That is not the same as proof of the broader claims made in marketing copy.
Guides in this section
Red light therapy bed: what a session delivers, and what the trials show
A red light therapy bed puts LEDs above and below your whole body for 10 to 20 minutes. The published bed trials report a lower irradiance than a good panel at six inches, one sham-controlled fibromyalgia trial is positive, and most recovery trials found nothing. Here is what a bed is, what to ask the clinic, and the safety points that change in an enclosed bed.
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Red light vs blue light therapy: what each one targets, and what the evidence supports
Blue light at about 415nm is aimed at acne bacteria near the skin surface. Red light at 630 to 660nm reaches deeper and is studied for skin texture and repair. Here is each one side by side, what the acne trials actually found, why red and blue together is the most studied pairing, and why blue is the one that asks more of your eyes and, for some skin, its pigment.
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Is red light therapy legit? What the evidence supports, condition by condition
Red light therapy is a real field with one guideline-backed use, a handful of conditions where sham-controlled trials agree, and a long tail of claims that rest on a single small study. Here is each one graded, what a home device can realistically deliver, and the side effects worth knowing.
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At-home red light therapy devices: the best panels of 2026, judged on irradiance
Of every at-home red light therapy device — panel, mask, belt or lamp — the panel is the one that publishes a dose you can check. Most brands still quote solar-meter irradiance figures that over-read by roughly 2x. We ranked the panels on the numbers that survive a spectroradiometer, and on which brands are honest enough to publish both.
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How often should you do red light therapy? Dose, distance and time (Sep 2026)
Dose equals irradiance times seconds. Get the irradiance figure wrong and every session is wrong. Here is how often, how long, and how far, with the arithmetic that answers 'is 10 minutes enough' exactly.
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Red light therapy belts, pads and mats: why LED count tells you nothing about dose
A red light belt sits on your skin, so distance stops mattering, and heat, LED spacing and the auto-off timer start to. Almost no belt publishes irradiance at contact, so we worked out the one ceiling the listings let us calculate, and picked four on what they state.
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Red light therapy for hair loss: what the sham-controlled trials show
Low-level light therapy has a real sham-controlled literature for pattern hair loss, measured in hairs per square centimetre on tattooed patches of scalp. Here is what those trials found, what the FDA clearance on the box does and does not mean, and what to demand from any cap.
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Red light therapy glasses: the two numbers the box has to state
Red light therapy glasses are only as good as their attenuation at the wavelengths your device emits, usually 660nm red and 850nm near-infrared. Most listings do not state it. Here is why near-infrared is the specific hazard, how to read optical density, and the two pairs we would consider.
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Hooga vs Mito Red Light: the bigger number is read on a different instrument
Hooga quotes 161 to 189 mW/cm² and Mito quotes more than 70, which makes Hooga look twice as strong. By Hooga's own account its figures come from a consumer meter, the instrument behind Mito's other number of more than 160. Here is the comparison on matched readings, size by size, with prices checked 5 October 2026.
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Do red light therapy masks work? The one number no brand publishes
Red and near-infrared light has a real published literature for skin. Whether the mask on your face delivers the dose those studies used is a different question, and the answer is usually unknowable — because almost no brand publishes the one figure that decides it.
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Red light sauna: what the term means, and what dose you actually get
Three different products are sold as a red light sauna, and only one of them reliably reaches a studied dose. The difference is distance, and here is the arithmetic.
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Size it, wire it, price it — before you order anything.
A spreadsheet that sizes your heater in kW, prices the 240V circuit, calculates chiller horsepower for your ambient temperature, and totals the installed cost. One email, no sequence.
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