The Planted Tank Forum - View Single Post - DIY PAR meter, Yeah you heard me
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post #24 of (permalink) Old 11-10-2010, 07:41 PM Thread Starter
Children Boogie
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Join Date: Dec 2006
Location: Cincinnati
Posts: 16,047
I found the equation... There were some guessing going on because I didn't know what hoppy's chart start value is.

It looks like these bulbs output are bell curves rather than parabolas.

f(d) = A * (11e^(-d^2/(2*35^2)))
A is the value from my DIY sensor, d is distance.

I'll graph this out to see how close they fit.

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