Written by Nordic Light Lab — the UK arm of a Scandinavian family of specialist light-therapy shops, including Lysterapi.no, Norway’s largest light-therapy store with over 10,000 customers. We sell the products we write about, and we say so openly.
Red light therapy has moved from physiotherapy clinics into British homes faster than good information about it has. This is our complete guide: what red light therapy is, what the evidence actually supports, how to choose between masks, caps, panels and blankets — and where each of our detailed guides digs deeper.
What red light therapy is
Red light therapy — photobiomodulation, in the research literature — uses specific wavelengths of visible red light (around 630–660 nm) and near-infrared light (around 810–850 nm) at intensities that do not heat or damage tissue. The proposed mechanism is that these wavelengths are absorbed in the mitochondria and nudge cellular energy production, which is why the research clusters around tissues that renew and repair: skin, hair follicles and muscle.
Two things it is not: it is not UV (no tanning, no burning), and it is not the same as a SAD lamp, which works through the eyes on your body clock rather than on the tissue it shines on.
Red light therapy benefits: what the evidence supports — honestly
We sell these devices, so read this section critically. Our view of the research, strongest first:
- Hair regrowth — low-level laser therapy for pattern hair loss has multiple randomised controlled trials and meta-analyses behind it, and laser caps are FDA-cleared for this use. Our hair growth guide goes through the evidence and realistic timelines (think months, not weeks).
- Skin — studies on collagen density, fine lines and skin tone are encouraging, though often small. The effect is gradual and depends on consistent use. See our LED face mask comparison.
- Muscle recovery and joints — a sizeable sports-science literature on soreness and recovery, with near-infrared doing much of the work. Covered in our panel buying guide.
- Weight loss, “detox”, and miracle claims — not supported. Where a product category leans on these claims, we say so: our sauna blanket guide talks you out of the calorie-burning marketing before making the honest case for the product.
Choosing a device: match it to the goal
The single most common buying mistake is choosing a device type first and a goal second. Work the other way:
| Your goal | Right device | Where to read more |
|---|---|---|
| Facial skin: fine lines, tone | LED face mask | LED mask comparison |
| Thinning hair | Laser cap | Hair growth guide |
| Muscles, joints, recovery | Red light panel | Panel buying guide |
| Whole-body sessions | Large panel or wall panel | Panel buying guide |
| Warmth, relaxation, wind-down | Sauna blanket | Sauna blanket guide |
For most first-time buyers who want one versatile device, a mid-size panel is the answer: it treats face, joints and muscles alike, and hangs on the back of a door.
How to actually get results
The research rewards boring consistency. A realistic starting protocol: 10–20 minutes per treatment area, three to five days a week, for 8–12 weeks before judging whether it works for you. Position the device at the distance the manual specifies — irradiance falls off quickly with distance — and treat bare skin, since clothing blocks the light. Take a photo on day one; gradual changes are invisible day to day.
Safety, briefly
Red and near-infrared light at these intensities is non-UV and gentle on tissue. The sensible precautions: use eye protection or keep eyes closed when treating the face with bright devices, and talk to your GP first if you are pregnant, have a photosensitive condition, or take photosensitising medication. We cover eyes in detail in our eye safety guide.
The rest of light therapy
Red light is half of what we do. The other half works through the eyes on your body clock: SAD lamps for dark-season energy and mood, sunrise alarm clocks for easier winter mornings, blue light glasses for evening wind-down, and plain engineered darkness — the humble sleep mask. Through a British winter, the body-clock side is arguably where most households should start.
Everything we sell carries a 90-day money-back guarantee — the honest way to find out whether a light therapy habit sticks for you.
Frequently asked questions
Does red light therapy actually work?
For some uses, the evidence is reasonable; for others it is thin, and anyone selling it should say which is which. The best-supported areas are skin (collagen, fine lines), hair regrowth in pattern hair loss, and muscle recovery. Claims about fat loss or 'detox' are not well supported. We cover the evidence honestly in each of our guides.
What is the difference between red light and near-infrared light?
Red light (around 630-660 nm) is visible and works mainly in the skin. Near-infrared (around 810-850 nm) is invisible and penetrates deeper, which is why it features in research on muscles and joints. Many devices, including our panels, offer both.
How often should I use red light therapy?
Consistency beats intensity. Most protocols in the research use 10-20 minutes per area, three to five times a week, for at least 8-12 weeks before judging results. One long session a week does little.
Is red light therapy safe?
It is non-UV and generally very safe. The main cautions are sensible ones: do not stare into bright panels, use eye protection when treating the face, and speak to your GP first if you take photosensitising medication or are pregnant.
Which red light device should I start with?
Match the device to the goal, not the other way round. Facial skin: an LED mask. Hair: a laser cap. Muscles, joints or whole-body: a panel. If you want one versatile device, a mid-size panel such as our InfraPanelX PRO covers the most ground.
Is red light therapy the same as a SAD lamp?
No. A SAD lamp uses bright white light through the eyes to shift your body clock and lift winter mood. Red light therapy works on the tissue it shines on - skin, hair, muscle - and is not a treatment for seasonal low mood. They solve different problems, and some households end up with both.