The Planted Tank Forum - View Single Post - DIY PAR meter, Yeah you heard me
View Single Post
post #24 of (permalink) Old 11-10-2010, 07:41 PM Thread Starter
No more Bow ties
mistergreen's Avatar
PTrader: (13/100%)
Join Date: Dec 2006
Location: Cincinnati
Posts: 15,351
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.

mistergreen is online now  
For the best viewing experience please update your browser to Google Chrome