This is an old revision of the document!
Definitions provided from https://www.konicaminolta.eu/fileadmin/content/eu/Measuring_Instruments/4_Learning_Centre/L_D/The_language_of_Light/language_of_light.pdf
Light Measurement Handbook by Alexander D. Ryer
Useful, on point and short.
Check at http://optdesign.narod.ru/book/light_measurement_handbook_1997.pdf or https://www.intl-lighttech.com/sites/default/files/pdf/handbook/ILT-Light-Measurement-Handbook.pdf
Language of light