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 Does It Take (Dave Days song) What Does It Take (Dave Days song) "What Does It Take" is a song by American singer Dave Days. It served as the third and final single from his 2010 EP "Dinner and a Movie". It is one of Dave's most recognizable songs, and was also played on Disney Channel's So Random!. The song's music video is set in a high school, where Dave realizes he has gotten the lead part in the school play. Amanda Lynn (Days' interest in the video) sees she has gotten the second lead, and runs to her boyfriend, who ignores her. Days and Lynn