The right dose of red light therapy is 10 minutes for the face, 10-15 minutes per area for the body and 15-20 minutes for the scalp, at a distance of 15-30 cm, 4-7 times a week. More is not better: photobiomodulation has a biphasic response, and beyond the optimal dose the effect drops off.
Why "more" does not work
Huang and Hamblin (2011, Dose-Response) described the biphasic curve of light therapy: at low doses the effect increases, at the optimal dose it peaks, and at doses that are too high the cell responds with oxidative stress and the effect disappears. In practice, 30 minutes on the same area can give a weaker result than 10. This is also why a good device has a timer.
How the dose is calculated
Dose (J/cm²) = irradiance (mW/cm²) × time (seconds) / 1000. Skin studies generally use 4-10 J/cm², muscle and joint studies 10-60 J/cm², because near-infrared light needs to penetrate deeper. A NeuroGenesis DNA panel with an irradiance of about 100 mW/cm² at 15 cm delivers 6 J/cm² in one minute, so 10 minutes means 60 J/cm² at the surface, enough for deep tissue.
Dose by area
| Area | Device | Duration | Distance | Frequency |
|---|---|---|---|---|
| Face, wrinkles | LED mask | 10 min | On the skin | Daily |
| Neck, décolleté | Neck mask | 10 min | On the skin | Daily |
| Scalp | Helmet | 15-20 min | On the scalp | 3-4/week |
| Neck and shoulders | Vest | 15 min | On the skin | Daily |
| Back, recovery | MAT 360 mat | 15-20 min | On the skin | Daily |
| Joints, small areas | CORE MINI 60 | 10 min | 5-15 cm | Daily |
| Full body | 90-180 cm panel | 10-15 min/side | 15-30 cm | 4-7/week |
When results appear
- Energy, sleep: 1-2 weeks.
- Pain, recovery after exercise: 2-4 weeks.
- Skin, wrinkles, firmness: 4-8 weeks, with an assessment at 12.
- Hair: 16-26 weeks.
Common mistakes
- Long, infrequent sessions instead of short, frequent ones.
- SPF cream or make-up on the skin during the session.
- Standing too far from the panel: doubling the distance cuts the dose by a factor of 4.
- Giving up after 2 weeks, before the skin or hair has had a chance to respond.
Frequently asked questions
Can I do more than 20 minutes?
It does not help. The effect is biphasic: beyond the optimal dose, the benefit decreases. Two areas of 10 minutes each are better than one of 30.
Morning or evening?
Both work. Morning for energy and focus, evening for relaxation and sleep. Choose the time you can stick to every day.
Can I combine the mask and the panel on the same day?
Yes, on different areas. The mask on the face for 10 minutes and the panel on the back for 10-15 minutes, in the same session or at different times.
The complete guide: Red light therapy: what it is, the studies and how to choose a device.
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