Red light promotes dermis-epidermis remodeling via TGFβ and AKT-mediated collagen dynamics in naturally aging mice

What the authors concluded

Histological analysis revealed that red light, but not white or green light, significantly improved surface roughness and increased dermal thickness in the skin of aged mice (Figure 1A), suggesting a wavelength-specific regenerative effect. " "Unlike other wavelengths, red light rapidly increased dermal thickness and stimulated epidermal renewal by enhancing collagen synthesis in dermal fibrobla

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 8 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.