Lumen is the old unit of luminosity of light
Hence, the statement is false.
The old unit of the luminosity of light is
What do you understand by the term luminosity of light? Name its old and SI unit. How many times the SI unit is bigger than the old unit?
The modern unit of luminosity of light is
The luminous flux of a monochromatic source of 1 W is 450 lumen watt−1. Find the relative luminosity at the wavelength emitted.