Relation between luminous flux (f) and luminous intensity (l)

Relation between luminous flux (f) and luminous intensity (l)

The luminous intensity in any direction of light source whose light distribution is uniform in all directions, is equal to the luminous flux divided by . Thus :

For example, an incandescent lamp of 2000 lumens, fitted in a globe luminaire of opal glass with a transmittance of 0,9 will (approximately) have in any direction a luminous intensity of :

This radiation is only of limited practical importance, as it is only valid for light sources that radiate equal luminous intensities in all directions.