More light is not more benefit
Red light follows a dose curve, and too much can undo the effect. Why the Red Light Bed has a lower-power residential mode.
The Research
Read the studies, not the hype.
Every piece here starts with a paper, names it, and says what it does and does not show. Written for people over forty who want the evidence before the equipment.
Collagen, measured: the full-body red light trial
The most cited red light skin trial used full-body devices and measured collagen with ultrasound. What it found.