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Guide to Red Light Therapy Dosing Before we get into a discussion of all the factors that go into device selection and how to get the ideal dose of light, let me preface this next section by saying that if you don’t care to understand all the technical aspects of this, that is perfectly fine. You don’t need to understand all of the factors that go into light selection, power density, joules, the nuances of the mathematical calculations and so on. If you just want the practical how-to guidance, you can skip to the summary “Key Points for Dosing.” I will just add that you do need to pay attention to my warnings not to overdo treatments. While red/NIR light therapy is very safe, thinking that “more is better” and then overdoing treatments will actually decrease the effectiveness. So make sure you understand and adhere to the general guidelines for dosing. Also, please note that dosing in red/NIR light therapy is a tricky and complex issue because of the wide variety of different types of devices (laser units vs. LED panels vs. other devices), a wide range of different doses used in various studies, the overall body surface area treated, the types of treatment (e.g. general light on an area vs. light on acupuncture points), the goals (e.g. performance enhancement vs. fat loss vs. skin anti-aging), and the specific body tissues you’re trying to affect (e.g. the skin requirement is very different than that of deep tissue, and something like the brain, which sits behind the skull, may require much larger doses to deliver a significant amount of light). Due to these complexities, different people sometimes have different views on the subject of ideal dosing. For example, I have talked to some people who recommend only very low doses, with lasers. Others who advise against lasers. Others who advise much larger doses than what I recommend here, and who think that it’s basically impossible to overdose on red/NIR light therapy. So there are a number of people in this field who don’t agree with each other on finer details. With all of that in mind, I am going to do my best here is to accurately represent the overall body of research and what I perceive to be general consensus of the world’s most respected experts on red/NIR light therapy. The dosing guidelines here are generally intended for use with LED panel-style light devices. (I’m assuming most people don’t want to spend $2,500-$30,000 on a laser device, and want to be able to do red/NIR light therapy for less than $1,000 or $500, so I’m focusing on how to do treatments with LED panel light devices rather than lasers.) Now, let’s get into a detailed discussion of applying what we’ve learned. If you want an effective light therapy session, you must have an effective dose. That requires: • A light that is relatively powerful (i.e. has an ideal “power density”) • Ideally, a light that can treat a large area of the body at once • An understanding of the optimal duration of time using the light to get the right total dose Too little of a dose and you get minimal to no effects. Too strong of a dose and you get minimal to no effects. Let’s talk about power density of the light first. As mentioned previously, most studies showing benefits of red/NIR light therapy used light outputs of 20- 200mW/cm2. This is basically a measurement of power density – how much power the light is emitting (in watts) over how big of an area. To put that in different terms, if you shine the light on your torso (let’s say, for the sake of ease of calculation, that it’s an area of 50cm x 40cm, which equals 2,000cm2)... And the light you’re using is 200 watts (which is 200,000mW), then you have 200,000mW/2,000cm2 = 100mW/cm2PDF Image | Red Light Therapy Ultimate Guide
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