On Sun, Aug 09, 2009 at 01:24:50PM -0400, Robert A. LaBudde wrote:
>
> But how does NIST calibrate the meter 
> in the first place?

http://physics.nist.gov/Divisions/Div844/facilities/photo/Candela/photo.html

and more importantly:

http://physics.nist.gov/Divisions/Div844/facilities/powr/powr.html

-Mar.
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