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candle ft calc.
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Posted by: RandyKimball
Barney
05/23/2004, 19:27:16

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I need to know how to figure the candle feet in a new building based (I assume) on the known number of watts of light from the overhead lighting at a known distance to the ceiling.

thanx
-randy-




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Re: candle ft calc.
Re: candle ft calc. -- RandyKimball Post Reply Top of thread Forum
Posted by: Cragyon
Bart
05/24/2004, 07:31:37

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Randy,

I think your assumptions are right.  You might research building codes and associated engineering data.  I'll bet there is an equation or standard for lighting requirements and assumptions.  Once you know how much light is available and the distance you should have enough for a estimate. 

Additionally,  have you ever seen those light source measuring devices which photographers use?  Maybe you can borrow one and measure directly?

Here are some basic conversions:

10.764 foot candle = lux

3.142 candle/sq. cm = lamberts

0.487 candle/sq. inch = lamberts

1 lambert    = 0.3183 c/cm2

1 lambert    = 2.0536 c/in2

1 lambert    = 1 lumen/cm2






Modified by Cragyon at Mon, May 24, 2004, 07:32:36

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