The Planted Tank Forum - View Single Post - DIY PAR meter, Yeah you heard me
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Old 11-10-2010, 07:41 PM   #24
No more Bow ties
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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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