Red light therapy is the everyday name for sessions under low-level red and near-infrared LED light. This guide explains what the light is, what a session involves, and what the research does and doesn't tell us so far.
Device specs quote wavelengths in nanometres (nm). We explain the difference between visible red (around 620–680 nm) and near-infrared (around 800–1,100 nm), and why the numbers on a box are only part of the story.
Irradiance is how much light reaches you, measured in mW/cm². It falls quickly with distance. We explain how we measure it with our own spectrometer and how to read a device chart honestly.
Manufacturers give guidance on session length and frequency. We look at what that guidance says, how a 30-minute clinic slot works, and how to build a routine that fits your week.
Who should speak to their GP or pharmacist before using red light, why goggles matter, and the medication and skin checks we run through before every first session.
Many people add red light to their skin-care routine for the look of their skin. We summarise where the research is, its limits, and why it's no substitute for SPF or medical advice.
Shorter days can feel hard. Ideas for a winter light routine, plus where to get support: if your mood is low, please speak to your GP or visit the NHS website.