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
What Kate Does week." VanDerWerff of the "LA Times", Ryan of the "Chicago Tribune", Sepinwall of "The Star-Ledger", Jensen of "Entertainment Weekly" and Mark Medley of the "National Post" also found the episode to contain humorous lines. This episode was watched by 11 million American viewers and 1.57 million Canadian viewers. What Kate Does "What Kate Does" is the 106th television episode of the American Broadcasting Company's "Lost" and third episode of the sixth season. It was written by executive producers Edward Kitsis and Adam Horowitz and directed in September 2009 by Paul Edwards. "What Kate Does" was first aired February 9, 2010,