What do light meters measure ?
everything i find says "it measures light", ... but blue is different from green, different from yellow, different from orange, different from red, different from ... and so on.
visible light, accepted as 400-700nm is a range of energy frequencies.
light meters, the little i am familiar with, (without owning one as i consider it waste of money to buy something that fills me with false confidence till i know what they are measuring.)
light meters measure "light" photons, from 400nm to 700nm and give an output reading of X, ...output readings could be 10, could be 24, could be 78, ... to say there is X amount of light
is it measuring an average ? (could provide spikes and valleys and still give a high average)
is it measuring specific wavelengths ? (could peak these wavelengths and low-ball everything else)
i would think every nm wavelength to be excessive, don't really care to know how much 400nm & 401nm & 402nm, ... but could measure ranges of 10, or 20, or 30, or whatever to give a good estimate of what various lights are giving out.
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so i wonder, ...what are light meters measuring ?
everything i find says "it measures light", ... but blue is different from green, different from yellow, different from orange, different from red, different from ... and so on.
visible light, accepted as 400-700nm is a range of energy frequencies.
light meters, the little i am familiar with, (without owning one as i consider it waste of money to buy something that fills me with false confidence till i know what they are measuring.)
light meters measure "light" photons, from 400nm to 700nm and give an output reading of X, ...output readings could be 10, could be 24, could be 78, ... to say there is X amount of light
is it measuring an average ? (could provide spikes and valleys and still give a high average)
is it measuring specific wavelengths ? (could peak these wavelengths and low-ball everything else)
i would think every nm wavelength to be excessive, don't really care to know how much 400nm & 401nm & 402nm, ... but could measure ranges of 10, or 20, or 30, or whatever to give a good estimate of what various lights are giving out.
---
so i wonder, ...what are light meters measuring ?