Originally posted by Ward L
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Not claiming perfection, but what I measured may me more than anecdotal.
Also, as it turns out, and depending on the nature of the light, and its frequency, the human eye is probably not a very good instrument to judge the transmittance or reflectance characteristics of various films with respect to solar radiation frequencies. In other words, hard water spots may very well look worse than they are with respect to how much they impair solar PV production. Sometimes things are not what they seem.
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