Candela was chosen so that the new definition would precisely match the old definition. Although the candela is now defined in terms of the second (an SI base unit) and the watt (a derived SI unit), the candela remains a base unit of the SI system, by definition. If a source emits a known luminous intensity "I" (in candelas) in a well-defined cone, the total luminous flux "Φ" in lumens is given by where "A" is the "radiation angle" of the lamp—the full vertex angle of the emission cone. For example, a lamp that emits 590 cd with a radiation angle
Estrella Cabeza Candela Estrella Cabeza Candela Estrella Cabeza Candela (; born 20 February 1987) is a Spanish professional tennis player. Cabeza Candela has won 11 singles and 13 doubles titles on the ITF circuit in her career. On 13 May 2013, she reached her best singles ranking of world number 95. On 2 April 2012, she peaked at world number 176 in the doubles rankings. Her best result in a WTA tournament is semifinals, reached in Hobart 2014. Cabeza Candela was born in Los Palacios y Villafranca. Coached by Gonzalo Lopez and Martin Vilar. Parents are Manuel Cabeza (tennis coach) and Estrella Candela;