The NIST Reference on Constants, Units and Uncertainty

Fundamental Physical Constants
Constants
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first radiation constant for spectral radiance
 $c_{1{\rm L}}$
 Value  1.191 042 953 x 10-16 W m2 sr-1
 Standard uncertainty  0.000 000 015 x 10-16 W m2 sr-1
  Relative standard uncertainty   1.2 x 10-8
 Concise form  1.191 042 953(15) x 10-16 W m2 sr-1    
 
Click here for correlation coefficient of this constant with other constants
Source: 2014 CODATA     
recommended values
 
Definition of
uncertainty
 
     Correlation coefficient with
any other constant

 
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