colour.constants.CONSTANT_KP_M# colour.constants.CONSTANT_KP_M = 1700.0# Rounded maximum scotopic luminous efficiency \(K^{\prime}_m\) value in \(lm\cdot W^{-1}\). Notes To be adequate for all practical applications the \(K^{\prime}_m\) value has been rounded from the original 1700.06 value. References [WS00d]