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
Vincent Candela taker. At club level, Candela played football in France with Toulouse (1992–95) and Guingamp (1995–97), before moving to Italian side A.S. Roma (1997–2005). He won one "scudetto" with Roma, as well as the Supercoppa Italiana, in 2001, also helping the club to the 2003 Coppa Italia Final. He later joined English side Bolton Wanderers (2005), before returning to Italy to play for Udinese (2005–2006), and Siena (2006–2007), as well as spending a spell on loan with Messina (2007). On 28 January 2007 he played his last Serie A match for Messina against Ascoli. For France, Candela was capped 40 times