One enzyme explains almost all of the rest.

No. The spectrum used starts at 590 nm, well above ultraviolet, which stops at 400 nm. There is no tanning and no UV-related photocarcinogenic risk. Any warmth you feel comes from the LEDs themselves, not from far-infrared heating.

Do not stare into the LEDs. The light is not dangerous at home irradiances, but it is dazzling in visible red and invisible in the near-infrared — so the blink reflex does not protect you. Close your eyes or use the goggles supplied with the device.

Anyone pregnant, on photosensitising medication (some antibiotics, retinoids, St John's wort), with an undiagnosed skin lesion, an eye condition, photosensitive epilepsy — avoid pulsed modes in that case — or undergoing cancer treatment. Our devices are wellness products: they replace no medical advice.

It depends what you are measuring. For muscle recovery, trials see an effect from the first session. For skin and hair, the reference studies measure at sixteen weeks of regular sessions. Be sceptical of any brand promising a visible result in a week.

Not beyond a certain point. The biphasic response means that past the optimal dose, the effect declines. High irradiance mainly lets you shorten the session — it does not replace consistency, and it makes respecting durations more important, not less.

Look at irradiance in mW/cm² at a stated distance, the exact wavelengths in nanometres, and the area actually covered. An LED count on its own tells you nothing. Our parameters are on every product page, and our selection method is set out in our values.