How Long and How Often? A Practical Dosing Guide to Red and Near-Infrared Light Therapy
Ken Pham
October 10, 2026
"How long should I use my red light panel, and how often?" is the most common question new users ask, and the honest answer is that it depends on the device. Session length, distance and frequency all change how much light reaches your skin. This guide explains the basic idea of dose, how to think about it, and how to build a sensible weekly rhythm. It is general educational background, not medical advice.
What does "dose" mean in light therapy?
Researchers describe light dose in joules per square centimetre (J/cm²). It is simply irradiance (how intense the light is, in mW/cm²) multiplied by time. The formula is: dose in J/cm² = irradiance in mW/cm² × seconds ÷ 1000. As a purely illustrative example, a surface irradiance of 50 mW/cm² for 10 minutes (600 seconds) works out to 30 J/cm². Published studies use a wide range of doses, and the right number depends on the wavelength, the area and the research question, so treat any single figure as background rather than a target.
Why does distance matter?
Irradiance drops as you move away from the panel. A device that delivers a given irradiance at the surface will deliver less at a greater distance, which is why the manual's recommended distance is part of the instructions and not a suggestion. If you change the distance, you change the dose. Read our guide on how deep red and infrared light penetrates for the wavelength side of the story.
How long should a session be?
Many consumer manuals suggest sessions in the range of roughly 5 to 20 minutes per area, but the right figure for your device is the one in its manual. Starting at the short end and staying consistent is generally a more sensible approach than starting long. Our beginner's guide to starting a routine walks through a gentle ramp-up.
How often per week?
Consistency tends to matter more than intensity. A common approach is several short sessions a week with rest days built in, adjusted to how your skin feels. More is not automatically better: studies often discuss a biphasic dose response, where too much light may be no more useful than too little. If you want the research background, see Understanding Infrared Light.
What are signs you may be overdoing it?
Skin that looks red, feels warm or tender after a session.
Headache or eye strain, which usually means eye protection or distance needs attention.
Feeling worse rather than neutral or relaxed after sessions.
If any of these happen, shorten or skip sessions, and stop use and see a healthcare professional if symptoms persist.
Weekly rhythm checklist
Use the distance and session length from your device manual.
Wear appropriate eye protection every session.
Start short, keep it consistent, and include rest days.
Use a timer so sessions do not creep longer.
Keep a simple log of date, area, time and how you felt.
Check with a doctor first if you are pregnant, photosensitive or on photosensitizing medication.
Frequently asked questions
Can I use red light therapy every day?
Some manuals allow daily use and others suggest rest days. Follow your device's instructions and how your skin responds.
Does a longer session work better?
Not necessarily. Research discusses a biphasic response, so longer is not guaranteed to be better. This article makes no claim that any session length will produce a specific result.
Is the dose the same for every panel?
No. Irradiance, wavelengths and distance differ by device, so published doses do not transfer directly between products.
If you prefer a hands-free session, the AuraDome offers 415, 590, 630 and 850 nm channels with a 1-Year Warranty, and the LUFAMAX1800, an FDA-registered general wellness device, carries a 3-Year Warranty.
Lufalight devices are general wellness devices, manufactured under MDSAP and ISO 13485 quality systems, with Health Canada MDL listing applicable where required for Canadian sales. They are not intended to diagnose, treat, cure, or prevent any disease.
Safety note: Follow included eye-protection guidance, avoid use during pregnancy or while on photosensitizing medication without consulting a doctor, and stop use and see a healthcare provider if you notice any adverse skin reaction. Individual results vary and are not guaranteed.
Explore the full lineup on the Lufalight collection page.