What the spec sheet cannot tell you

We have not personally tested these devices. This is buying research, not medical advice. How we assess products

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.

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

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.