Задача 40139.

Specific, the power of the lamp, which has the shape of a capa with a diameter of 6 m, is equal to 0.85 W / Kd. Determine the light output of the luminaire in lm / W, the total luminous flux, luminosity and brightness, if the light intensity of the ball is 170 cd.

A detailed solution with a brief description of the condition, formulas and laws used in the solution, the derivation of the calculation formula and the answer.
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