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Overall, the device needs to emit light above a certain power density (light intensity), needs to be at the right wavelengths, be at the proper distance away from your body, and ideally, needs to be physically large enough to emit light over a large portion of your body. But for simplicity, let’s leave all these nuances of the calculations out of it. The next part of the equation is how long should you apply the light. The dose (duration of exposure) is calculated by: Dose = Power Density x Time So all we are doing is taking that number we already have (mW/cm2) and then the “dose” can be calculated once you know how long you should apply that light for. (If this sounds complex, don’t worry, because it’s actually VERY simple if you get the lights I recommend). Here’s the equation you need to calculate the dose: mW/cm2 x time (in seconds) x 0.001 = J/cm2 Here’s the critical piece of information you need to know: The dose you want to shoot for is between 3J/cm2 – 50J/cm2. (Note: Depending on whether you’re treating superficial areas like the skin or surface wounds or deeper tissues like muscles/organs, etc., you want different doses. We’ll talk more about the specifics of those treatment goals in a later section of this book.) Here are some sample calculations to show you how this works: ● 25mW/cm2 applied for 40 seconds gives 1J/cm2 ● 50mW/cm2 applied for 20 seconds gives 1J/cm2 ● 75mW/cm2 applied for 15 seconds gives 1J/cm2 ● 100mW/cm2 applied for 10 seconds gives 1J/cm2 What that means is that if you have a device with a power output of 100mW/cm2 (at the distance you are using it), then you want your treatment time to be between 30 seconds-7 minutes on a given area of your body (that will equate to roughly 3-50J/cm2). If you have a device that has 50mW/cm2 (at the distance you are using it), your treatment time would be 1-14 minutes on each area. That’s a pretty wide range of times, so let me simplify this. If you get either of the two top lights I recommend, they emit roughly 90mW/cm2 at a distance of 6” away from the light, about 55-65mW/cm2 at a distance of about 12 inches away from the light, 35- 45mW/cm2 at 18 inches away, and 25-30mW/cm2 at 24” away. If you’re a more visual person, this will help get what I’m saying here: Irradiance at 6" Irradiance at 12" Irradiance at 18" Irradiance at 24" 85-95mW/cm2 55-65mW/cm2 35-45mW/cm2 25-30mW/cm2 Now you might be wondering, “Okay, so how do I know whether to use it for 1 minute or 10 minutes? And how do I know whether to use it from 6” away or 24” away?” Good questions! For skin issues (e.g. anti-aging benefits) and other more superficial (near to the surface) body issues, there are a few things to note. We want a relatively low overall dose on each area of skin, of roughly 3-15J. Also, there is some indication that lower power densities (below 50mW/cm2) may actually be more optimal for treating the skin than very higher power densities. This may cause you to think that low power lights are okay, but high power lights still have a huge advantage because they allow you toPDF Image | Red Light Therapy Ultimate Guide
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