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powerful device) but still not deliver enough light to the target tissues to reach therapeutic levels. According to Hamblin et al.: “For example, the application of a 100-mW laser will deliver higher irradiance at a given depth than a 1-mW laser (assuming all other parameters are equal). The former might generate enough light (threshold) to produce a meaningful therapeutic effect at the required depth in the target tissue, whereas the latter will not, regardless of the length of the illumination time. Therefore, technically speaking, a claim such as ‘this system penetrates deeper than others by virtue of extra-high power’ may be true.”373 Simply put: If you want to treat deeper tissues below the skin, I strongly suggest getting a high power device rather than a low power device. 2. Convenience:Don’tunderestimatethesimplepowerofbeingabletodoanentiretreatmentin 1-5 minutes vs. having to do it for 10-40 minutes. A smaller and weaker light will require much longer sessions to treat a significant area (or areas) of your body. A light that can treat the entire front of your body at once and allow you to treat virtually all areas of your body in less than 5-10 minutes, whereas a smaller or weaker light may require 5-10 times longer to accomplish the same thing. (And due to differences in penetration depth, they may still be less effective.) So convenience is a huge benefit of larger and more powerful lights. For many people who are busy, this is the difference between actually making time to do it vs. just having another thing sitting in your garage unused because you don’t have the time. 3. Body area treated at once: This is a huge factor as well. The bigger more powerful devices allow you to do something very cool. They allow you to stand further back from the light (2 or 3 feet away) and still have enough power output to reach therapeutic levels. This allows the light to spread out and hit a much larger area of your body at once. In this way, a light that is 20 or 30 inches long can effectively treat the entire front or back of your body at once, from head to toe. Basically, a light that size can effectively act the same as a light twice the size. In contrast, if you take a small light and stand 2 or 3 feet away, it’s still only going to hit a relatively smaller portion of your body, but more importantly, if the light is low wattage, you have to be within 6” of it to even get therapeutic effects – so standing back 2 or 3 feet will decrease the power density so much that you’re no longer getting an effective dose (even if the light is technically hitting a large portion of your body). So ideally, you want a light that is both high wattage and relatively large, so you can treat large areas of your body at once with effective doses. Without getting too complicated, I should also mention that the power of the light and the distance from it also impacts the effectiveness of the dose. Even when the calculated total doses are equal between devices, results may not be the same. So if you use a powerful light for 2 minutes, the end result may be different from a much weaker device used for 20 minutes – even if the total dose of both is 10 Joules. So total dose is not the only thing that matters – the power of the light and distance from the body also influence the end result. I believe that for both skin issues and deeper tissues, a high-power light is superior. This may seem counter-intuitive at first, because how could a high-power light be best for both contexts where you want to treat surface issues with low doses (and lower light intensity) and for deep tissues where you want higher doses (and higher light intensity)? Here’s why: • For skin issues, a high-power device gives you the ability to place it much further away from your body while still having optimal light intensities. In fact, with a high-power device, you want it to be further away to give a little lower power density of below 50mW/cm2. Most importantly, the fact that light spreads as you move further from the source creates a huge advantage. By having the light source further away, it allows the light to spread and hit a far larger area of your body at once! So basically, it makes the treatment much more time-efficient compared to a lower powerPDF Image | Red Light Therapy Ultimate Guide
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