17th October 2019

wikipedia
14

How do you measure luminous flux?

Units. The SI unit of luminous flux is the lumen (lm). One lumen is defined as the luminous flux of light produced by a light source that emits one candela of luminous intensity over a solid angle of one steradian.

Regarding this, how light intensity is measured?

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.

What instrument is used to measure light?

A photometer, generally, is an instrument that measures light intensity or the optical properties of solutions or surfaces. Photometers measure: Illuminance. Irradiance.

How light can be measured?

Unit of light flow or luminous flux. The output of artificial lights can be measured in lumens. Unit of illumination equal to one lumen per square metre. The metric equivalent of foot-candles (one lux equals 0.0929 footcandles).
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