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PhyCalc quantity radiance info

### Engineering friendly unit aware unicode compatible online calculator

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The SI unit for radiance is: W/(m^{2}·sr) (watt per square meter steradian)

The dimension of radiance is M T^{-3}.

Radiance is the 1st derivative of radiance of a surface per unit frequency with respect to time.

Common formula symbols for radiance are: *L*_{e,Ω}