Diode counts and colour counts dominate the marketing. The figures that actually decide whether a mask works — irradiance, wavelength accuracy, coverage and the type of evidence — are the ones most brands won't show you. Here's how to judge for yourself.
Irradiance — the power density actually delivered to your skin (mW/cm²) — most directly governs whether a session does anything. Yet almost every major brand treats it as a trade secret. A brand that publishes its power figures, and backs them with instrument-measured studies, has earned more of your trust than one that asks you to take the result on faith.
Red and near-infrared light have a substantial, peer-reviewed evidence base for collagen, wrinkles, firmness and healing; blue light for blemishes. We keep a referenced library of the original studies — read it before you buy.
Full face & neck, made in Japan, UKCA/CE certified, with measured results — the device we judge strongest on the criteria above.
See the Radiance Kit →