How I Test Every Device
No lab coat, no fancy facility — just me, my meters, and a lot of time spent standing in front of glowing panels. Here's exactly how I evaluate each device.
Why I Do This
The red light therapy market is full of inflated specs and mystery claims. Manufacturers love to overstate irradiance, fudge wavelengths, and conveniently forget to mention EMF output. I got burned by this twice before I started testing things myself.
Every device I review gets assessed across five areas: irradiance output, wavelength accuracy, EMF levels, build quality, and how it actually feels to use. I cross-reference manufacturer specs against third-party lab data where I can find it, real customer reports, and the published research on therapeutic dosing.
If I can't verify a spec, I say so. And if a device's claims don't hold up? That shows up in the score.
What I Measure
Irradiance at 6″ and 12″
Measured in mW/cm², irradiance is the single most important spec for whether a panel actually does anything. I check at both 6 inches (close-contact) and 12 inches (where you'll actually stand). You need at least 30–50 mW/cm² at 12″ for real therapeutic dosing.
Wavelength Verification
Red (630–660nm) and near-infrared (810–850nm) are the wavelengths with the strongest research backing. I check that devices actually emit within their claimed ranges and flag panels that use cheap LEDs prone to spectral drift.
EMF at Treatment Distance
I measure electric and magnetic field emissions at typical treatment distances and classify devices as Low (<1 mG), Moderate (1–3 mG), or High (>3 mG). Higher EMF doesn't necessarily mean harmful, but it's worth knowing — especially if you're sensitive to it.
Heat Output
Excess heat usually means cheap LED drivers, and it gets uncomfortable during longer sessions. I check surface temperature and whether the airflow actually keeps things cool.
Noise Levels
Fan noise is a bigger deal than you'd think. I check whether fans are audible at treatment distance and note any rattling or buzzing from the housing — because nobody wants to meditate next to a jet engine.
Flicker
High-frequency flicker (above 1000 Hz) usually isn't a problem, but some budget devices have visible flicker at low dimming levels. I flag this when I can confirm it through testing or when enough users report the same issue.
How I Score
I rate devices on a 6.0–9.5 scale. I don't use 1–10 because the realistic range of decent devices is narrower than that — anything scoring below 6.0 wouldn't make it onto the site in the first place. Here's what each tier means:
Exceptional
Best-in-class irradiance, verified wavelengths, low EMF, excellent build. These are the ones I tell my friends to buy.
Strong across all metrics with only minor trade-offs. Most of my top picks land here.
Good
Solid performance at a fair price. Some compromises in build or irradiance at higher distances.
Acceptable
Entry-level devices that deliver therapeutic light but come with real limitations you should know about.
Scores are determined by a weighted formula: irradiance (35%), wavelength accuracy (20%), EMF (15%), build quality (15%), features & value (15%). Devices that fail our minimum irradiance threshold are capped at 7.0 regardless of other scores.
My Independence
I've never published a sponsored review. I don't accept free products in exchange for coverage. I don't sell “featured placement” or “best of” rankings. Every recommendation comes from my own testing.
I do use affiliate links — when you buy a device through my links, I earn a small commission at no extra cost to you. That's how I keep this site running and keep buying panels to test. I link to both Amazon and direct brand programs, and neither commission structure affects my ratings.
If a device I've rated highly scores poorly in new testing, I update the review and the score. My ratings reflect what I know now, not what I thought when I first published.
About Me
I'm Jenna — a mom of two, former personal trainer, and someone who spent way too long wading through confusing, contradictory, and often sponsored “reviews” before figuring out which devices actually work.
After buying two panels based on inflated specs and being disappointed by both, I decided to build the resource I wished existed: a site that treats buyers like adults, measures what matters, and isn't afraid to call out the devices that don't deliver.
Have a device you think I should test? Found an error in my data? Email me at jenna@redlighttested.com. I read everything.