Red light and collagen density: a 136-person controlled trial
This German study asked whether a broad spread of light (orange-red through infrared) works better for skin than red light alone, and whether either one changes collagen deep in the skin.
Short answer. A useful finding for anyone reading spec sheets: in this trial, the red band did the work, and a wider spectrum did not add extra benefit.
What they did
113 volunteers were randomly put into four treatment groups and 23 into an untreated control group. Treated groups had either a red-only light (611–650 nm) or a broader light (570–850 nm), twice a week for 30 sessions, using full-body light beds rather than face masks.
Assessors who did not know the groups rated photos. Ultrasound measured collagen density, surface mapping measured roughness, and participants rated their own skin.
What they found
Treated people had smoother skin, better reported complexion and higher collagen density on ultrasound. Blinded photo ratings agreed that the treated groups improved more than controls.
The broad spectrum did not beat red light alone. Adding more wavelengths did not add more benefit in this study.
What it cannot tell you
Irradiance and session length varied between groups, so the trial cannot isolate one ideal setting. The control group was small and received no sham light.
In short
A useful finding for anyone reading spec sheets: in this trial, the red band did the work, and a wider spectrum did not add extra benefit.
Masks with these wavelengths
Ten of the 10 masks in the comparison list a wavelength in the band used here (red, 611–650 nm). They are examples, listed alphabetically, each with our specification page and the manufacturer’s own product page. They are not recommendations, and the links carry no affiliate parameters.
- CurrentBody Skin LED Mask Series 2633 · 830 · 1072 nm · CurrentBody product page
- CurrentBody Skin LED Face Mask Series 3415 · 532 · 590 · 633 · 830 · 1072 nm · CurrentBody product page
- Dr. Dennis Gross DRx SpectraLite FaceWare Pro415 · 630 nm · Dr. Dennis Gross product page
- Dr. Renú SpectraLift Advanced465 · 530 · 630–660 · 850 nm · Dr. Renú product page
- Nanoleaf LED Light Therapy Face Mask460 · 520/525 · 640 · 850 nm · Nanoleaf product page
- Omnilux Contour Face633 · 830 nm · Omnilux product page
- Shark CryoGlow FW312415 · 630 · 830 nm · Shark product page
- Silk’n LED Face Mask 100463 · 592 · 633 nm · Silk’n product page
- The Light Salon Boost LED Face Mask (Boost Advanced)633 · 830 nm · The Light Salon product page
- Therabody TheraFace Mask Glo415 · 633 · 830 nm · Therabody product page
Matching a wavelength is not the same as matching the study. Dose, irradiance, session length and schedule also differ, and a mask’s reported output is not independently measured. See how dose works and home vs clinic doses.
This is a plain-English summary of the published abstract, written by LED Translated. It is not medical advice, and it does not mean any mask reproduces this study’s results. Read the original record on PubMed, and talk to a qualified clinician about your skin.