Question

Light intensity used to be measured according to this?

Answer 1

Answer. The lux (symbol: lx) is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.

Answer 2

Answer: The lux(symbol:lx) is the Sl unit of illuminance and Luminous emittance,measuring Luminous flux per unit area.It is equal to one lumen per square meter.In photomerty,this used as a Measure of the Intensity , as preceived by the human eye,of Light that hits or passes through a surface .