Guide topic
Red Light Dose
Plain-English, research-cited guides to dosing red light therapy.
Guide
Red light therapy dose calculator
Enter your panel's irradiance to get J/cm² or the minutes for a target dose — with biphasic-window warnings. Free.
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Guide
How to calculate red light dose (J/cm²)
The irradiance × time formula, why distance changes everything, and how to compare panels on real numbers.
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Guide
Why more red light isn't better
The biphasic dose response — too little, the optimal window, and too much — and what it means for session length.
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Guide
How long should a session be?
Why there's no single number — session length comes from a target dose and your panel's irradiance, not the clock.
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Guide
Minutes by distance & power (dose table)
A worked table of session minutes for a target dose, and why distance dominates via the inverse-square law.
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The app for this
Lumen: Red Light Calculator
Pick your panel and distance, set a target dose, and Lumen returns the session time — with biphasic-window guardrails from the Hamblin research. Free to download.