Blog: Guides, Science and Evidence Updates (Page 2)
Every article on the index, newest first. 73 articles.
Beam Angle Explained: 30 vs 60 vs 90 Degrees
Beam angle sets how tightly an LED panel's light concentrates at a given distance, and how much area it covers. What 30, 60 and 90 degrees trade off.
Red Light Therapy for Acne: What the Combination Trials Show
What two randomized trials on blue-plus-red LED light found for acne, why most home panels lack the blue channel they used, and what has not been tested.
How Long Should a Red Light Therapy Session Be?
Session length follows from a target dose divided by your panel's measured irradiance. The formula, two worked examples, and the ceiling not to chase.
Joules per cm2 Explained: How Red Light Dose Is Measured
J/cm2 is irradiance times time divided by 1000. The formula, two worked examples, and the doses actually used in the trials this site cites.
Red Light Therapy Glossary: 40 Terms Explained
Short definitions for the wavelength, dose, spec and trial terms used across this site, each linking the full explainer page.
The Biphasic Dose Response: Can You Overdose on Red Light?
Two mechanistic reviews describe the Arndt-Schulz curve in light therapy - why more light does not mean a better result, and where that ceiling actually comes from.
Study Review: The Wunsch Red and Near-Infrared Skin Trial
A 2014 trial treated 113 people twice weekly for 15 weeks with red and red-plus-near-infrared light and measured collagen density and skin roughness.
Red Light Therapy Dosing Explained: Joules Made Simple
Dose is irradiance times time. What each term means, the ranges trials actually used, and three worked examples with real panel and trial figures.
850nm Near-Infrared: The Standard NIR Band
850nm sits on 93% of red light panels, tied with 660nm. The near-infrared default, the trials behind it, and the depth it actually reaches.
660nm vs 850nm: Which Wavelength Do You Actually Need?
The two most common panel wavelengths compared: what depth each reaches, what each was tested for, and how panels split power between them.
Study Review: The Stausholm Knee OA Meta-Analysis
A 2019 pooled analysis of 22 trials and 1,063 patients is the single biggest input to this site's knee osteoarthritis grade. What it pooled and found.
How the Rankings on This Site Are Computed
The four scoring fields behind every ranking on this site, how a method-labeled figure beats an unlabeled one, and a worked example from one list.
How This Site Grades Evidence: Strong to Insufficient
The four evidence grades this site uses, the trial hierarchy behind them, and one worked condition example at each grade, from knee pain to weight loss.
660nm Red Light: The Workhorse Wavelength
660nm sits on 93% of red light panels. What the wavelength does, the trials that used it, and how it differs from a nearby label like 655nm.
Study Review: PBM Plus Exercise for Knee Osteoarthritis
A four-arm trial tested light plus leg exercise against exercise alone in women with knee osteoarthritis. What it found, and what it did not.
Sham-Controlled Trials: How to Read a Red Light Study
What a sham-controlled trial is, why blinding is hard when the light itself is visible, and how to read an abstract's claims against its design.
Inverse Square Law: Why It Only Half Applies
The inverse square law predicts how fast light fades with distance, but a flat panel is not a point source, so it fades slower than the law says up close.
What Distance Should You Sit From a Red Light Panel?
Most panels are built for 6 to 24 inches. Closer gives a higher, more concentrated dose; farther trades intensity for coverage. Here is how to pick.
Study Review: Phototherapy Before Exercise (2015)
A 2015 meta-analysis pooled 13 higher-quality trials on phototherapy timed around exercise, covering time to exhaustion, repetitions and muscle damage.
Red Light vs Near-Infrared: What Is the Difference?
Red (about 600-700nm) and near-infrared (700-1100nm) trigger the same cell mechanism but reach different depths. What separates the two bands.
How Deep Does Red and Near-Infrared Light Penetrate?
What computational modeling and skull-transmission studies actually report about light penetration, and why "penetrates two inches" is not supportable.
Joovv Solo 3.0 vs PlatinumLED BioMax 600
Two mid-size panels from the two oldest brands in the database compared on price, wavelengths, irradiance disclosure and warranty.
RLT Home Total Spectrum MAX vs MitoPRO 1500X
Two panels that both publish per-wavelength density. What the allocation, irradiance disclosure, price and warranty differences actually mean.
Study Review: Whole-Body LED Bed for Fibromyalgia
A triple-blinded RCT put 42 women with fibromyalgia in a 660/850nm LED bed for 12 sessions. What the pain scores showed, and the gap to a panel.