Topic is very good
MarinSimpkins568 last edited by
lorna Oct 30, 2018, 12:19 AM
So, the thing to remember is that when we say "blue light" that isn't a standard measurement - meaning that many people use a slightly different definition. It's literally a spectrum, and to speak with certainty about how much is being blocked, we have to define the range first, of both the filter and of the light source.