"Lumenwa": The energy emitted by a light source in a unit of time to make people feel light is called "light flux", and its unit is "lumen". "Lumenwa" is a "lumen/watt" reading, which refers to the ratio of the luminous flux emitted by the light source to the electrical power it consumes, that is, the luminous efficiency of the light source.
"mcd": The spatial density of luminous flux, that is, the luminous flux per unit solid angle, called the luminous intensity, is the amount that measures the intensity of light emission. The Chinese name is "candela" and the symbol is "cd". The "m" in front is the prefix, which means one thousandth (like the length unit, the Chinese name is "m", its symbol is "m", and the addition of an "m" to "mm" in front becomes One thousandth of a meter, that is, millimeters), so the Chinese reading of "mcd" is "Man Candela".
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