Explanation of mcd and lumens

"Lumen Wall": energy per unit time makes light emitted to the space created light feeling called "flux", the unit is "lumen." "Flow Ming Wa" is "lm / W" readings, the electric power ratio refers to light flux emitted by which it consumes, i.e., luminous efficiency of the light source.

“mcd”: The spatial density of luminous flux, which is the luminous flux per unit solid angle, is called luminous intensity . It is a measure of the luminous intensity of a light source. The Chinese name is “Candela” and the symbol is “cd”. The preceding “m” is the prefix, which is one thousandth of the meaning (like the unit of length, the Chinese name is “m”, the symbol is “m”, and before it is added “m” becomes “mm”, it becomes One thousandth of a meter is millimeters, so the Chinese reading of "mcd" is "millendra".