J=W*s (watt * second);
M: mega 1M = 10^6;
m: millimeter 1m = 10^-3;
1MJ/㎡/year= 1*10^6(W*s)/㎡/year= 1000000/3600 Wh/㎡/year= 1000/3600/365 kWh/㎡/day, which is also commonly used in the solar field Another unit of: "peak hours of sunshine", 6000MJ/㎡ = 4,566 kWh/㎡/day, we can also say that the peak hours of sunshine are 4,566 hours. The average daily sunshine is equivalent to the amount of radiation from 4.566 hours of sunshine under standard conditions (1000 W/㎡).
MJ is a unit of energy, while mW and MW are units of power and cannot be converted.