by "Nicholas O. Lindan" <see@[EMAIL PROTECTED]
>
Oct 30, 2007 at 09:57 PM
"Nicholas O. Lindan" <see@[EMAIL PROTECTED]
> wrote
> 1 lumen (lm) = 1/683 Watt at 555nm = 1 (non-existent) green candle (cd)
> 1 lumen / m^2 = 1 lux
> 1 lux-second = 1 cd-second/m^2
Oh, I munged that up.
1 lm = 1 candle-steradian where a steradian is the solid
angle that illuminates 1 m^2 at 1 m (or 1 ft^2 at 1 ft).
1 lux-second = 1 cd-sr-sec/m^2
= the illumination of 1 candle at a distance of 1 meter
for one second.
As if anyone cares.
--
Nicholas O. Lindan, Cleveland, Ohio
Darkroom Automation: F-Stop Timers, Enlarging Meters
http://www.darkroomautomation.com/index.htm
n o lindan at ix dot netcom dot com
