Efficacy of a wearable 660 nm red light therapy device in alleviating neck pain and enhancing neck function

What the authors concluded

After 4 weeks of treatment, the average VAS score decreased by 65% on the left side (P < 0.0001) and 66% on the right side (P < 0.0001)." "Moreover, subsequent to two weeks of red light treatment, a notable 27% decrease was observed in the PSQI scores of the participants (p = 0.0001), indicating an improvement in sleep quality (Fig. 4b). This reduction in PSQI scores suggested a positive respons

Devices that emit this wavelength

Matched on wavelength within 15nm, since LED bins vary by roughly that much and a tighter match would be false precision. Where we have an irradiance figure, the session length is the time needed to reach this study's dose of 48 J/cm² at that intensity.

Matching a wavelength is not the same as reproducing a trial. Session times assume the device's published irradiance is accurate at the distance it was measured, which on brand-claim figures is often optimistic. Where a device publishes both a peak and an average we use the average, and where it publishes a falloff curve we use the lowest figure, so these times run long rather than short. Clinical protocols also control for spot size, contact and skin type in ways a home device cannot.