if we take something like a 7mm lengthscale, wed expect e^(-40/7) = 0.3% of light at 4m, which sounds more reasonable (and similar OOM as https://t.co/9oPv8tvN4o)
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Near-infrared photonic energy penetration: can infrared phototherapy effectively reach the human brain? https://t.co/msgBrHas5e
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@ScottAdamsSays "NIR in the power range of 10–15 W at 810 and 980 nm can provide fluence within the range shown to be biologically beneficial at 3 cm depth" https://t.co/iC5ROrbJyn
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