The distance from the light source to the illuminated surface.
The area on the flat surface that is illuminated.
Refers to the light that hits the current surface.
The total luminous flux emitted from the current light source.
Refers to concentration of light in one direction.
The one which spreads the light measured in steridians.
| Illuminance: |  |
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| Illuminance: |  |
| Luminosity: |  |
| spatial angle: |  |
| spatial angle: |  |
| Convert spatial angle: |  |