"Joseph B. Reid" wrote:
>
> James Frysinger wrote in USMA 18778
>
> >The candela *is* photometrically related. Its definition is absolute
> >only at one frequency (corresponding to ~555 nm in free space). For
> >other frequencies, the luminous efficiency function is used. The CIE
> >standard luminous efficiency function is photonic (daylight).
>
> 555 nm is the wavelength to which the human eye is most sensitve.
Indeed, for daylight conditions. I had stated that this was where the
photopic luminous function curve peaked but failed to give this
equivalent statement. Some may have been lost in my technical gibberish
and thereby missed that point. Thanks, Joe!
Jim
--
Metric Methods(SM) "Don't be late to metricate!"
James R. Frysinger, CAMS http://www.metricmethods.com/
10 Captiva Row e-mail: [EMAIL PROTECTED]
Charleston, SC 29407 phone/FAX: 843.225.6789
