Study of transcranial photobiomodulation at 945-nm wavelength: anxiety and depression.

What the authors concluded

The 945-nm LED transcranial photobiomodulation improves brain activity and may clinically decrease anxiety and depression." Comment: The paper is somewhat strangely written, and it seems that the between-the-groups changes (before-after) haven't been tested for statistical significance.

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 9.35 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.