Radiometric and Photometric Quantities
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Subscripts used in Illumination Engineering NotationS – Source Quantity D – Detector Quantity e – Energetic (Radiometric Quantity) v – Visual (Photometric)
Quantities used in Illumination Engineering NotationdA – Infinitesimal area element Q – Energy (Luminous or radiant) Φ – Flux (Luminous or radiant) Ee – Irradiance Ev – Illuminance M – Exitance (Luminous or radiant) I – Intensity (Luminous or radiant) Le – Radiance LV – Luminance r – Distance ω – Solid Angle
Conversion Equation from Radiometric Quantity to Photometric QuantityWhere, Km is the constant which is called maximum spectral luminous efficacy and its value is 683 lm/W.