The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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Click symbol for equation
first radiation constant for spectral radiance
 $c_{1{\rm L}}$
 Numerical value  1.191 042 972...  x 10-16 W m2 sr-1
 Standard uncertainty  (exact)
  Relative standard uncertainty  (exact)
 Concise form  1.191 042 972... x 10-16 W m2 sr-1    
The full description of unit m2 is m-2×(m/cycle)4.
 
Click here for correlation coefficient of this constant with other constants
Source: 2018 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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