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Gabriel Chan

Lighting instrument candlepower data field

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Peak Candella in will give you foot-candles out.

 

Lumens takes into account both intensity and distribution, so isn't as applicable to a simple cone-spread calculation.

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Candlepower can be approximated by

distance from source(Squared) * footcandles = Candlepower  

but distance needs to be in feet, you can't mix metric and imperial units on this.

I got this calculation from the Photometrics handbook and what my Algebra teacher taught me way back when on how to solve for X if you have Y and Z in X/Y=Z

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9 hours ago, Rob Books said:

Candlepower can be approximated by

distance from source(Squared) * footcandles = Candlepower  

but distance needs to be in feet, you can't mix metric and imperial units on this.

I got this calculation from the Photometrics handbook and what my Algebra teacher taught me way back when on how to solve for X if you have Y and Z in X/Y=Z

 

Thanks Rob! Helpful to know how you arrived at those candlepower numbers in the stock symbols. However approximated they are, at least they give me a degree of confidence with using those numbers.

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