Blog: Guides, Science and Evidence Updates (Page 4)
Every article on the index, newest first. 202 articles.
Best Portable and Travel Red Light Devices
Compact red light panels compared on footprint, power source, method-labeled irradiance, price, warranty and trial terms, using database fields only.
Study Review: Penetration Modeling by Wavelength (2017)
A 2017 computer simulation of light in skin found depth rose with wavelength and that beams wider than about 10 mm added little. What it can and cannot say.
Best Red Light Panels for Sleep and Evening Use
Four panels ranked on evening controllability, red and NIR channels, flicker and indicator data, with a plain note that sleep evidence is thin.
Combining Red Light With Sauna and Cold Plunge
No trial tests red light, sauna and cold plunge as a stack. Here is a sensible order, how heat and light interact, and where the evidence stops.
Reactive Oxygen Species and Hormesis in Red Light
How small, short-lived reactive oxygen species may act as signals after red light, why high doses may flip that, and what it means for session length.
Red Light Therapy for Tennis Elbow: The Evidence
Tennis elbow and red light therapy graded Limited: one pooled grip strength result, mixed small laser trials, and no panel studies. Doses and gaps.
Red Light Therapy for Rosacea: A Thin Evidence Base
Rosacea and red light therapy graded Insufficient: one small add-on trial with oral minocycline, no panel studies, and what would change the grade.
Is Red Light Therapy Safe During Pregnancy?
No trial has tested red light therapy in pregnancy, so safety is unknown. What that means, what to ask your clinician, and how to think about a panel at home.
Nitric Oxide and Red Light: The Blood-Flow Idea
The proposal that light frees nitric oxide from cytochrome c oxidase, why it suggests better blood flow, and how little of it is shown in people.
Red Light Therapy for Tendinopathy: The Dose Evidence
Evidence grade Moderate for laser in tendinopathy, with the meta-analyses and trials behind it, what was not studied, and what it means for a home panel.
Study Review: Laser for Plantar Fasciitis and Tendons (2022)
A 2022 BMJ Open meta-analysis of 18 trials on laser for lower-limb tendinopathy and plantar fasciitis, with its dose findings and what they mean for a panel.
Study Review: Laser Therapy for Achilles Tendinitis (2006)
A small placebo-controlled crossover trial that measured prostaglandin E2 in the tendon after 904nm laser. What it found, and what it cannot say about a home panel.
The Optical Window: Why Red Light Therapy Works at 600-1100nm
The optical window is the stretch of the spectrum where blood and pigment absorb less and water has not yet taken over. Here is how panel wavelengths sit in it.
Optical vs Electrical Power: A 300W Panel Is Not 300W
Why the wattage in a panel's name is not the light it emits, how electrical input splits into light and heat, and worked examples from the database.
Mitochondria, ATP and Red Light: The Mechanism Explained
How red and near-infrared light is proposed to act on mitochondria and ATP, which steps are shown in cells, and which are still hypotheses for people.
How Much Electricity Does a Red Light Panel Use?
Running cost per session and per month for red light panels, worked from the wattage in model names at three assumed electricity rates, with the caveats.
Chromophores: What Absorbs Red and Near-Infrared Light
Which molecules absorb red and near-infrared light in the body, how that shapes penetration, and why skin tone and hydration change the dose a panel delivers.
Study Review: 670nm Light and Aging Vision (2020, 2021)
Two small 670nm trials from one lab reported better color contrast and rod function in adults around 40 and older. Design, limits, and the eye-safety gap to a panel.
Cytochrome c Oxidase: Red Light Therapy's Main Target
What cytochrome c oxidase is, why it is the leading proposed photoacceptor for red and near-infrared light, the neuron study behind it, and the caveats.
Treatment Area and Coverage: What a Panel Actually Treats
Effective treatment area is the part of a panel's light field that reaches useful irradiance at your distance. How to estimate it and count session positions.
Price per Milliwatt: A Red Light Panel Value Index
Price divided by method-labeled irradiance times emitting area for seven spectrometer-tested panels, with the method, the ranking and its limits.
Red Light Therapy for Delayed Onset Muscle Soreness
Evidence grade Limited: two meta-analyses, 2016 and 2025, reached different conclusions on soreness. Trials, wavelengths, what was not studied.
Red Light Therapy Before or After a Workout?
Pre-exercise trials report performance benefits; post-exercise trials report soreness and strength outcomes. Both protocols from the trial parameters.
Study Review: ELATED-2, Transcranial NIR for Depression
A sham-controlled pilot of 823nm light on the forehead for major depression: design, dose, the three effect sizes it reported and its caveats.