What is a lux?
- Thread starter Lazlo
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the lux (light in latin) is the standard international unity for lumination.
imagine a part of a ball, 1 m radial, 1 metersquare the surface. Imagine a candle in the center of this part ball. one lux is about the total quantity of light received by the 1 m2 surface, since the unity of light intensity , the candela (candel in latin) is about the one of a candle.
The lumination is to be reguarded as the quantity of light falling on one spot or surface, from one direction (it's vectorial).
It depends : on the intensity (punctual source) or luminance (extended source) of the source
on the distance of the considered spot or surface to the source (it actually decreases with the square of the distance).
on the relative angle beetween both surfaces (if so) of the source and receiver.
imagine a part of a ball, 1 m radial, 1 metersquare the surface. Imagine a candle in the center of this part ball. one lux is about the total quantity of light received by the 1 m2 surface, since the unity of light intensity , the candela (candel in latin) is about the one of a candle.
The lumination is to be reguarded as the quantity of light falling on one spot or surface, from one direction (it's vectorial).
It depends : on the intensity (punctual source) or luminance (extended source) of the source
on the distance of the considered spot or surface to the source (it actually decreases with the square of the distance).
on the relative angle beetween both surfaces (if so) of the source and receiver.
ModellingAgencies
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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.
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