The numbers that decide value: irradiance measured at a stated distance, cost per watt, warranty length and restocking terms. These are FDA-registered general wellness devices, not FDA-approved treatments for any condition.
Last updated: October 2026. First verification sweep in progress.
Headline irradiance numbers mislead when the measurement distance differs: a figure quoted at 0 to 6 inches is not comparable to one at 12 to 18 inches. Compare only figures measured at the same distance, ideally third-party tested. Wavelengths and panel size matter alongside irradiance, and total dose is irradiance multiplied by time.
Only same-distance figures are comparable. We note the measurement distance next to every number.
Panel price divided by rated wattage, so size differences do not hide value differences.
A cheaper panel with a restocking fee and short warranty can cost more than it saves. We verify terms on each brand's own policy pages.