Candela is the unit of which of the following?
Candela is the unit of Luminous intensity. Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle. The SI unit of luminous intensity is Luminous flux per unit solid angle or Lumen per Steradian or Candela.
Luminous efficiency of a fluorescent tube is
Illumination of one lumen per sq. meter is called ____________