Quantities and units used in photometry

They are basically the same as the radiometric units except that they are weighted for the spectral response of the human eye and have funny names. A few additional units have been introduced to deal with the amount of light reflected from diffuse (matte) surfaces." Read more about the symbol used, units, and chart cmpares of photometry click here

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What is the difference between lambertian and isotropic? Both terms mean "the same in all directions" and are unfortunately someti...