What does a candela measure ?
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
Félix Candela works. Candela also benefited from the budget implemented by Ruiz Cortines in the area of education. Candela became a professor in Mexico, which is what he did for the remainder of his career. Felix moved to the United States and taught at University of Illinois at Chicago from 1971-1978. Candela was hired as a Professor of Architecture at the university's Chicago Circle campus (now University of Illinois at Chicago) on September 1, 1971, a position he held until 1978. Source: Fausto Giovannardi, ed.: "Felix Candela, Builder of Dreams" Candela's drawings, correspondence, personal and professional papers, and writings are held in