Use specifications to ask better questions. They are not a substitute for comparable measurements or product-specific evidence.
We have not personally tested these devices. This is buying research, not medical advice. How we assess products
A missing measurement is not a lower score
Give your comparison sheet three labels: published, independently measured and unknown. Record a manufacturer figure as published even if it sounds precise. Record it as independently measured only when the source identifies the device and test conditions. Leave unavailable values unknown. This prevents a well-documented product from appearing worse than one with impressive but unexplained numbers.
| Decision | Next step | Why it matters |
|---|---|---|
| LED count | What is counted? | Chips, bulbs and emitting points may differ. |
| Wavelength | Which mode and exact model? | A component specification is not a clinical outcome. |
| Output | Distance, instrument, area and mode? | Peak and averaged readings answer different questions. |
Read the definition next to the number
A bulb, an LED chip, and a light-emitting point may not be counted the same way. Omnilux, for example, lists 132 LEDs in 66 bulbs for Contour Face. If another product advertises a different count, first establish what each brand is counting. A larger headline number alone does not prove a better purchase. Read the source
Separate the three evidence questions
First, what does the brand say is inside the device? Second, has someone measured the device under disclosed conditions? Third, is there relevant human evidence for the outcome being advertised? A specification answers the first question. It cannot answer all three.
Make comparisons like for like
If an output claim attracts you, request the distance, setting, instrument, and coverage information. Mito Red Light’s comparison page explicitly separates readings by instrument type. Preserve those distinctions when building a shortlist instead of treating every quoted figure as equivalent.
Ask what a study actually compared
Before accepting a dramatic percentage, look for the study population, number of participants, duration, comparison group, and how the outcome was assessed. Was the result an instrument measurement, an evaluator’s assessment, or the participant’s own opinion? Each tells you something different. Keep brand-sponsored research identified as such.
A practical message to send the seller
Please send the manual for this exact model, the measurement conditions behind its output specification, and the study supporting the result advertised on this product page. Please also confirm whether an opened device can be returned if its fit or setup does not suit me.
A specific answer is useful even when it contains limitations. If the answer is only another sales claim, keep the question open. Our comparisons show those open questions rather than filling them with a score.
One number, four missing qualifiers
Suppose one page advertises “100 mW/cm²” and another “50 mW/cm².” Before calling the first twice as powerful in practice, establish the measurement distance, instrument, operating mode and whether the reading is a local peak or an average over an area. If any of those differ, the simple ratio can conceal more than it explains.
A further distinction is electrical consumption versus optical delivery. The watts drawn from the wall do not by themselves tell you how evenly light reaches the skin. Keep the units and definitions attached when you build a comparison table. A missing measurement condition is missing information, not a zero.
Translate marketing into a verifiable question
| Marketing phrase | Ask instead |
|---|---|
| Full-face coverage | What area is illuminated in the intended wearing position, and what is shielded? |
| Comfortable fit | Whose face was it tested on, for how long, and can an opened unit be returned? |
| More light sources | Are you counting bulbs or emitting chips, and what does the measurement show? |
| Money-back guarantee | When must the RMA be requested, and what costs are deducted? |
Do not reward a manufacturer merely for supplying more numbers. Favor answers that help you compare like with like and that can be checked against the exact device documentation.
Ready to make a shortlist?
Compare four face masks by format and routine, with links to our research and the manufacturers.
Compare LED face masks ↗Frequently asked questions
Does a larger LED count prove better coverage?
Not by itself. The layout, wearing position and evidence about light distribution matter too. Start by checking whether brands count LEDs in the same way.
Can I compare electrical watts with irradiance?
They describe different quantities. Electrical consumption does not directly tell you the light reaching a given area of skin.
What does clinically tested tell me?
Ask what was tested, on whom, for how long and against what comparison. A study of a general technology is not automatically evidence for the exact device you are buying.
Considering Ulike ReGlow?
Start with the ReGlow buying guide for the model, fit questions and purchase terms. If you are also considering iRestore, read our Illumina vs ReGlow comparison before choosing.
Sources & verification
Editorial structure updated September 10, 2026. Original source checks: September 8, 2026; selected manufacturer specifications and policies rechecked September 10. Consumer accounts retain their original attribution and limitations. Prices and terms may change.
Product links lead directly to manufacturers and are not affiliate tracking links in this edition.