Theories About Light Part3: Illuminance Luminance and Colorimetry
Illuminance and Luminance Illuminance is another quantity derived from intensity which denotes luminous flux density. It has a special name, lux, and is lumens per square meter, or lm/m2. The symbol is Ev. Most light meters measure this quantity, as it is of great importance in illumination engineering. Some examples for typical illuminances range from 100,000 [...]
Photometric Terms
Luminous flux: Φ, Lm Luminous flux is the sum total of the amount of light per second generated by the illuminant. Light intensity: I, cd The luminous intensity is the luminous flux from a point source emitted per unit solid angle in a given direction. A goniophotometer can be used for measuring light intensity. Illuminance: [...]
