Re: ATM A little electronic help on my Foucault tester

["Mark D. Holm" <mdholm@telerama.com>]

Steve JB Bouton wrote: 

>Not quite.  A candela is a unit of luminous intensity (brightness).  A
>lumen is equivalent to the light emitted in one steridian by a uniform
>point source of one candela.  So, lumens would be candelas per steridian.
>This came from "The Illustrated DIctionary of Electronics".

OK.  Now, how do these compare to more familiar units like watts.  Is a lumen directly
convertable to watts?  Or, perhaps a lumen is essentially "color blind", in effect
counting photons without regard to their energy?  I have actually wondered about this for
a number of years and have never put forth the effort to find out.  If someone knows, I
would sure like a short explanation.

Thanks,

Mark Holm
mdholm@telerama.com