Use a red light therapy panel 8–50 cm from the skin for 10–30 minutes a session, at most 30 minutes a day on the same area. Within that limit you can use it every day; studies have used rhythms from twice a week to every evening. Smart Series panels measure 132–152 mW/cm² at 15 cm.
How often should you use red light therapy?
Research hasn't settled on one best rhythm, and our usage guidance doesn't set a weekly number. What the research does show is how differently studies have scheduled their sessions:
Twice a week. In a 2014 controlled study, 113 volunteers had sessions twice a week with either red light or a broader red and near-infrared spectrum. The researchers measured skin roughness, collagen density and complexion after 30 sessions and compared them with a control group without light (Wunsch & Matuschka).
Every evening. A 2012 study gave 10 female basketball players 30 minutes of whole-body red light every evening for 14 days and explored their sleep quality against 10 players without light (Zhao et al.).
Around training. A 2016 trial followed 48 men through a 12-week strength-training programme with light before and/or after each session (Vanin et al.).
These are what the studies did with their own devices and doses, not a promise of the same outcome at home. The common thread is regularity: each protocol repeated the same session over weeks. So pick a rhythm that fits your week, whether that's two evenings or every morning, and keep it steady long enough to judge it.
Can you use red light therapy every day?
Yes, as long as you stay within the daily limit per area. Every day isn't required, though: the twice-weekly protocol above is just as much a routine.
The limit exists because more light isn't automatically better. Research explores a biphasic dose response: a 2009 review describes cell and animal experiments in which lower amounts of light often showed better results than higher ones (Huang et al.). That's why our guidance caps the daily time per area instead of suggesting longer or extra sessions.
The limit counts per area. A session on your face and another on your back are two different areas.
How long should a session be?
Between 10 and 30 minutes. If you're new, start at the shorter end and keep that for a few weeks before you change anything. Use the panel's timer so every session is the same length.
Time and distance work together. The closer you are, the more light reaches the skin per minute; further away, the light covers a larger area. Choose a distance within the range and keep it the same from session to session; our guide to setting the distance explains how.
What time of day is best for red light therapy?
The one you'll keep. None of the studies cited here compared morning and evening sessions, so the time of day is a question of habit: after your morning shower, after training or as part of your evening routine.
Two of the studies above show how the timing was chosen around a goal. The 2012 study scheduled its sessions every night. The 2016 trial compared light before and after strength-training sessions: the group that had light before training and placebo after showed larger gains in its strength tests than the other groups. That trial used handheld laser and LED probes, not a home panel. If you train, our article on red light before or after a workout goes into more detail; for evening use, read red light and your sleep routine.
How do you build a routine you'll keep?
Change one thing at a time. Keep the distance, the session length and the time of day the same for a few weeks. If you change all three at once, you won't know which change mattered.
Make it easy to start. A panel that stays set up next to a mirror or in a corner of the bedroom gets used. The Smart Small suits the face, neck and shoulders on a table stand; the Smart Medium also reaches the back or legs, on a floor stand or wall mount. You can compare them in our panel collection. Both are made by a partner manufacturer to RedLightMed's specification and European (CE) requirements, and every unit is checked in Hungary.
Protect your eyes and check who it suits. Close your eyes or wear the goggles; there's a pair in every box.
It isn't recommended for children under 12, while breastfeeding, with epilepsy, with known tumours or metastases, or if you're sensitive to light. During pregnancy, only after talking to your doctor.
Sources
Wunsch A, Matuschka K. A controlled trial to determine the efficacy of red and near-infrared light … Photomed Laser Surg, 2014. PubMed 24286286
Zhao J, Tian Y, Nie J, Xu J, Liu D. Red light and the sleep quality and endurance performance of Chinese female basketball players. J Athl Train, 2012. PubMed 23182016
Vanin AA, Miranda EF, Machado CS, et al. What is the best moment to apply phototherapy when associated to a strength training program? Lasers Med Sci, 2016. PubMed 27371449
Huang YY, Chen AC, Carroll JD, Hamblin MR. Biphasic dose response in low level light therapy. Dose Response, 2009. PubMed 20011653
