"The candela is defined by the luminous efficacy of monochromatic radiation"
The candela is defined by the luminous efficacy of monochromatic radiation of frequency 540 THz
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⚑ held by convention · challengeableThis claim has no dependencies — the drill terminates here. Not because bedrock was reached, but because this is where the community currently agrees to stop digging. It is epistemically identical to every other node: held by convention, and challengeable.
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Answer
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The SI base unit of luminous intensity, the candela, is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540 × 10^12 Hz, K_cd, to be 683 when expressed in the unit lm W^{-1}, which is equal to cd sr W^{-1}, or cd sr kg^{-1} m^{-2} s^3, where the kilogram, metre and second are defined in terms of h, c and Δν_Cs.
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