I have recently gone on a deep dive on red light therapy, as elicited by listening to your podcast. I am wondering if you are able to direct me to substantive studies existing on if the type of red light exposure needed to reap the benefits touted by the modality? I have not come up with much info on my end. Specifically, do LED (strand lights) vs “bulbs” vs pricey panels deliver similar results. Does this matter? Thanks! Angie

Yes—the device’s label or shape alone doesn’t tell you whether it will work. For skin treatment, the relevant factors include wavelength and the device’s energy output, light density, and treatment duration; those vary considerably across products marketed as red light therapy. In the dermatologist’s account, larger wall panels tended to deliver more energy and were generally better represented in studies than battery-powered masks. 1 2

• 1. Wavelength and intensity: The discussed red/near-infrared range was about 650–800 nm. The episode stressed that the appropriate wavelengths matter more than marketing claims about maximum intensity, while the dermatologist noted that energy output and light density also differ between devices. 3 4
• 2. Panels and treatment use: Panels were discussed for illuminating skin and biological tissues; the AMA described a typical viewing distance of around 18 inches, though the appropriate distance depends on the device. For eye exposure, avoid light that is painful or makes you squint, and the episode advised discussing extensive protocols with an eye-care professional. 5 6
• 3. Nighttime bulbs and strands are a different use: Dim red bulbs or other red lighting can be used at night to reduce exposure to bluer light while staying awake. That circadian-lighting use is distinct from therapeutic red-light treatment of skin or other tissue; the episode explicitly says red bulbs can be used at night and a panel isn’t needed for that purpose. 7 8
• 4. Timing: For the red-light protocol discussed for neuronal function, exposure was recommended early in the day, within three hours of waking. 9
• 5. DIY option: A bright flashlight covered with a filter that passes selected long wavelengths was described as a possible low-cost option. The episode also emphasized not using light bright enough to hurt the eyes. 10

So, strands, bulbs, and panels aren’t automatically interchangeable for therapy: compare their actual wavelength and output, and distinguish therapeutic exposure from dim red lighting used at night.