Re: ATM A little electronic help on my Foucault tester]

[Steve JB Bouton <sjbbouton@juno.com>]

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".


On Mon, 03 Dec 2001 20:50:39 -0800 Paul Cousoulis
<paulcsouls@worldnet.att.net> writes:
> 
> 
> 
> Hi James
> 
> According to the Gilway Technical Lamp Engineering Catalog:
> 
> "The output of LEDs is typically expressed in millicandela(mcd). The
> candela is defined as the number of lumens per steradian of solid 
> angle.
> It is usually measured along the projection axis of the device and 
> gives
> the eye's response to the light."
> 
> To choose a resistor for your LED.
> 
> Resistance = (Battery_Voltage -
> LED_Forward_Voltage)/(LED_Normal_Current) 
> 
> Clear Skies
> Paul
> 

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