Red Light Therapy Buying Guide: 7 Specs Worth Comparing
6 min readWhen you compare red light therapy devices, 7 specs do most of the talking: wavelengths, LED count and chip design, irradiance, coverage, timers and modes, power source, and the returns policy behind the listing. Everything else on a product page is adjectives. This guide explains what each spec means, with real numbers from published spec sheets.
(For the basics of how these devices work, see what is red light therapy.)
The 7 specs at a glance
1. Wavelengths: the first thing to look for
Wavelength is the light's exact color, in nanometers. The common published pair is 660nm (visible red) and 850nm (near-infrared, barely visible). Some devices add more: our Flexible Pad publishes 630nm and 850nm plus amber (605nm) and blue (460nm) modes.
Not every maker publishes wavelengths. RGB-based masks often state colors instead —our silicone mask lists 7 colors from an RGB 3-chip array, red included, and its page says exactly that rather than inventing a number. And when a listing states a suspiciously precise wavelength with no other documentation, read it the way you would any unverifiable spec: as a question to ask, not a fact to assume.
2. LED count and chip design: beads vs chips
An "LED" on a spec sheet can mean a bead (the visible bump) or a chip (the emitter inside the bead) —and 1 bead can house several chips. Two honest listings can quote different-looking numbers for similar hardware, so always ask which one you are reading.
Neither number is wrong; they are counting different things. A bigger count mostly signals a bigger or denser array, not automatically a better device.
3. Irradiance: read it with a raised eyebrow
Irradiance is light output density, in milliwatts per square centimeter (mW/cm²), and it is always a manufacturer-declared figure. It changes with distance from the array, and brands measure it in different ways at different distances —which makes cross-brand comparisons loose at best.
How to use it: compare irradiance figures within one brand's lineup, note the stated measurement distance, and be skeptical of round, spectacular numbers with no distance attached. Where a maker does not publish irradiance, expect the listing to say so rather than guess.
4. Coverage: match the array to the area
Coverage is the practical spec: how much of you the device addresses in one session. There is no universal "enough"; there is only matching the array to where you will actually use it.
Panels cover the most from a distance (our 432-LED panel on its 61-inch stand covers the torso in one sit). Wraps state their dimensions —the Belt Wrap's strip runs 7 by 50 inches. Masks cover exactly one face, sometimes plus a neck piece. The mask vs panel comparison is really a coverage decision in disguise.
5. Timers and modes: the unattended test
A built-in timer with auto shutoff is the spec that makes a device a habit rather than a chore —you settle in, and it ends the session for you. Typical ranges run 5 to 30 minutes. Modes and brightness levels let one device serve different evenings.
6. Power source: plug, USB, or battery
Wall-powered devices (check 110-130V for US outlets) never run out mid-session; battery devices go cordless. Battery specs worth reading: capacity (our mask carries a built-in 1200mAh cell) and how it charges. USB-powered wraps split the difference —plug into a wall adapter at home or a power bank on the sofa.
7. Returns, warranty, and where it ships from
The spec sheet behind the spec sheet —and the one most buyers skip.
A generous, clearly written policy is a maker putting its own money behind the hardware —the most honest spec there is.
Published specs from our shelf
| Device | LEDs | Light | Power |
|---|---|---|---|
| Panel with Floor Stand | 432 | 660nm + 850nm | Wall, 50W |
| Flexible Pad | 720 (180 × 4) | 630nm + 850nm (+ 605, 460) | Wall |
| Belt Wrap | 105 tri-chip beads | 660nm + 850nm | USB |
| Silicone Mask | 103 beads (RGB 3-chip) | 7 colors, red included | Battery, 1200mAh |
| LED Scalp Cap | 97 diodes | 660nm + 850nm | Wall, 110-130V |
Frequently asked questions
Are more LEDs always better?
No —more LEDs mostly means more coverage or a denser array. A 103-bead mask is not an inferior 432-LED panel; they are different tools. Decide where the device will live first, then compare counts between devices of the same format.
Why do some listings not state wavelengths?
Usually because the maker specifies colors (RGB arrays) rather than lab-measured wavelengths. That is not automatically disqualifying —but the listing should say so plainly, the way our mask's page does, instead of leaving you to assume.
What matters more: irradiance or coverage?
They answer different questions —intensity at a point vs area addressed at once —and only coverage is easy to verify from photos and dimensions. Read irradiance as a manufacturer's declared figure with a stated distance, and weigh coverage against your actual routine.
What should I check before clicking buy?
Run the 7 specs top to bottom, then read the returns policy word by word. If the listing publishes its numbers, admits what it does not publish, and stands behind a clear return window, you have found a spec sheet you can shop from.
Keep reading
Rubalume devices are wellness devices, not medical devices. Our guides describe what the devices are and how they are used. For the formal details, see our Wellness Disclaimer.