Transcranial near-infrared photobiomodulation could modulate brain electrophysiological features and attentional performance in healthy young adults.

What the authors concluded

The study presented that light irradiation with 850-nm LED source on right PFC could change brain electrical activity and has beneficial effects on attentional performance." Comment: The authors claim that fluence ("energy density") was 60 J/cm2 but according to the other parameters it seems the dose was 60 J (radiant energy) and 42.75 J/cm2 (fluence).

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 60 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.