Candela frequency and that has a radiant intensity in that direction of watt per steradian. The definition describes how to produce a light source that (by definition) emits one candela, but does not specify the luminosity function for weighting radiation at other frequencies. Such a source could then be used to calibrate instruments designed to measure luminous intensity with reference to a specified luminosity function. An appendix to the SI Brochure makes it clear that the luminosity function is not uniquely specified, but must be selected to fully define the candela. The candela is sometimes still called by the old name
Rosario Candela Italian-American architect, Gaetan Ajello. After another brief stint with the firm of Frederick Sterner, Candela set up his own practice in 1920. His first major commission was for an apartment house at West 92nd Street and Broadway. Shortly thereafter, he received his first commission for an East Side apartment at 1105 Park Avenue. During the next five years, Candela designed a number of residential buildings on the Upper West Side, primarily on West End Avenue and Riverside Drive. During this period, the West side was undergoing an intense transformation from an area of primarily single-family homes to one characterized by