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That’s a great power density. But, beyond this simple calculation, there are a few nuances here that make this simple calculation considerably more complex: 1. Distance from the light. It’s also important to be aware that this measure of power density decreases dramatically by moving further from the light source. So you’ll get the highest doses by being within a few inches of the light. Moving further away than about 3 feet from the light (as a general rule) and you’ll get little to no effect on anything below the surface of the skin. (And that’s using a powerful light. Many lights won’t provide effective doses beyond just 12” away.) Essentially, moving closer to the light increases the potency of the light dose, and moving further away dramatically decreases the dose. However, closer is not universally better – I generally advise staying at least 6 inches away to minimize exposure to EMFs (electromagnetic fields), just to err on the side of caution. This applies to all electronic devices, from TVs to dish washers to blenders. So the sweet spot is generally between 6 - 36 inches, and we’ll talk more later about when to go closer and when to move further away depending on your goals. But again, the point here is to understand that distance from the light dramatically affects the dose your cells receive. 2. Wavelengthsofthelight.Certaindevicesemitallthelightoutput/wattageintheeffective therapeutic wavelengths, and others emit only part of their total wattage in therapeutic wavelengths. Therefore, they may have 20-60% of their total wattage at non-therapeutic or non- optimal wavelengths. This also factors into the dose. When this is the case, it makes calculations quite complex. 3. Claimed wattage vs. actual wattage. The claimed wattage of a light differs from the actual power output of the light. This is a critical difference One thing is the claimed wattage that the light device is rated for, and another thing is the actual intensity of the light emitted. Generally, lights emit a power density about 25-50% lower than the claimed wattage would suggest. So the truth is that even with the calculation above, it’s really just a theory. You don’t know the true light intensity output of the light you get until you actually measure it. You have to rely on actual measurements using a PAR meter, rather than calculated measurements based on theoretical wattages. Don’t worry – I’ve already done all this for you, so you don’t have to worry about it. But again, be aware that the actual light output of many devices may be a whopping 50% lower than what the companies are claiming! (If you’re interested in learning more about this point, Platinum Grow Lights has videos on their website where they compare actual light emission from various lights that are all rated at the same wattage. They even show in the video how massively the actual light output can differ from the claimed power.) 4. Sizeofthedevice/treatmentarea.Oneothernuancethat’simportanttonotehereisthat even if a device is technically powerful enough to create beneficial effects, it may still be too small. In other words, one can have a device that has a power density of let’s say 100mW/cm2, but it may be a device with only a few inches circumference and thus, only emits light over a small area of your body. If you’re trying to treat large areas of your body, this makes things extremely inefficient and time-consuming.PDF Image | Red Light Therapy Ultimate Guide
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