3 ms·

No need to believe here, there are possibilites to measure that. https://en.wikipedia.org/wiki/Lux https://en.wikipedia.org/wiki/Lux http://www.wikihow.com/Mea

by mkesper 12y ago

No need to believe here, there are possibilites to measure that. https://en.wikipedia.org/wiki/Lux https://en.wikipedia.org/wiki/Lux http://www.wikihow.com/Measure-Light-Intensity http://www.wikihow.com/Measure-Light-Intensity