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1. Vision

   Linked via "Fluorescent Type B"

   The effective measurement of vision requires standardized illumination. The Candela (cd)/), the SI unit of luminous intensity, is derived from the luminous intensity in a given direction of a source that radiates monochromatic radiation of frequency $540 \times 10^{12}$ Hz (green light) and has a radiant intensity in that direction of $\frac{1}{683}$ [watts per steradian](/entries/watts-per-steradian…