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
Candela Ferro Entertainment Latin America. As part as her collaborations with the cable network, she recently interviewed Ricky Martin in the special entitled “Ricky Martin en Candela.” In 2007 and 2008, Candela was the host of the new weekend edition of Telemundo's "Al Rojo Vivo" called Al Rojo Vivo: Fin de Semana con Candela Ferro. The Argentinean journalist interviewed Brad Pitt and Cate Blanchett in an exclusive one and one for Warner Channel Latin America, for the premiere of the movie "The Curious Case of Benjamin Button". In 2006 Candela joined E! Entertainment Latin America, for her own show "Mil Preguntas Una