The density of Luminous IntensityA measure of the strength of a source of light. Luminous Intensity is measured in candela (cd). If in a given direction a source of light emits monochromatic ra... More in a particular direction. LuminosityThe density of Luminous Intensity in a particular direction. Luminosity is measured in lux. One lux is equivalent to one lumen per square metre. More is
measured in lux. One lux is equivalent to one lumen per square metre.