How We Test Red Light Therapy Masks

The protocol

1. We obtain a unit

   Masks are bought at retail wherever the budget allows. Where a manufacturer supplies a unit, that is disclosed prominently on the review itself and on any ranking the product appears in — not only in the footer. We do not accept review conditions, embargo terms that require approval of conclusions, or payment for a position.

2. We record the specification claims first

   Before touching the device, we record what the manufacturer states: wavelengths, irradiance, dose, session length, LED count, warranty, return period, and the exact page or document each figure came from. These are stored as claims with a source, so nothing can later be mistaken for our own finding.

3. We photograph the unit as received

   Packaging, the mask front and interior, the controller, the charger, the strap and the eye protection. Our own photographs only — we do not use manufacturer imagery to illustrate a review.

4. We measure the light output

   Emission is measured at the distance the mask actually sits from the skin, not at whatever distance produces the largest number, and the distance is published with the figure. Where the emitted spectrum can be characterised, peaks are reported individually rather than as a single marketing "red light" claim.

5. We map facial coverage

   Coverage is assessed against a fixed set of zones — forehead, cheeks, perioral area, jawline, under-eye and neck where applicable — and recorded photographically on more than one face size, because a mask that covers a large face well can leave gaps on a small one.

6. We run full-length sessions

   Sessions are run at the manufacturer’s recommended duration, repeatedly, over a period stated in the review. Comfort, pressure points, strap slip and the practicality of the controls are recorded during use rather than reconstructed afterwards.

7. We measure heat

   Surface and skin-contact temperature are recorded over a complete session, along with whether automatic shut-off behaves as documented.

8. We check the paperwork

   Warranty terms, return window, safety documentation, contraindication guidance and any regulatory or laboratory documentation the manufacturer will supply. What we asked for and did not receive is reported too.

9. We score, then edit

   Category scores are entered against the published weights, and the overall figure is computed from them rather than assigned. A second person reviews the draft against the evidence before publication.

Equipment

Measurement equipment will be listed here by make and model, together with its stated accuracy and calibration status, before the first review is published. We are not going to name instruments we have not yet bought.

This matters more than it sounds. An irradiance figure is only meaningful alongside the instrument that produced it, the distance at which it was taken and the ambient conditions. A review that gives you a number without those things is asking you to trust it rather than check it.

What we cannot tell you

Being clear about the boundaries of this work is part of doing it honestly.

• We do not run clinical trials. We measure hardware. We cannot tell you what a device will do for your skin, and we will not imply otherwise.
• We are not a certified laboratory. Where a figure requires laboratory conditions we do not have, we say so and report the manufacturer's documentation as what it is — their documentation.
• We test the unit we hold. Manufacturing varies between units and between production runs. A single sample is a single sample, and reviews say when a finding might not generalise.
• Long-term durability takes long-term time. Durability statements are limited to the period we have actually had the device, and that period is stated.

Claims versus findings

Every specification on this site carries a label showing where it came from: a manufacturer claim, documentation we have read, an observation of ours, a measurement of ours, or a third-party test report. Those labels are visible next to the values, not buried in a methodology page you would have to go looking for.

If a manufacturer claims 100 mW/cm² and we measure less at the distance the mask actually sits, both numbers appear, both are labelled, and the review says which one describes your experience.

Retesting and corrections

Products are retested when a manufacturer revises the hardware or firmware, when a reader reports behaviour we did not observe, or when a review passes its review interval. Prices are re-checked more often than the rest of the review, and every price on the site carries the date it was checked.

When we get something wrong, we correct it, label the correction, and leave it in the change history rather than editing the page silently. That process is described in our corrections policy.

Independence

Brands do not see reviews before publication, do not get approval over conclusions, and cannot buy a position in a ranking. Where any material connection exists — ownership, consulting, a free unit, sponsorship — it is disclosed on the review and on every ranking containing that product. See the editorial policy and the ownership disclosure.

If you believe something on this site is wrong, tell us: editor@redlighttherapymaskreviews.com.