Quote Originally Posted by davejohnwright
I started this thread thinking about the lumen decrease due to distance http://boards.cannabis.com/advanced-...e-formula.html . But the only way to figure out how many lumens are where is with a light meter it seems.
And I know about how decieving the wattage of light you use is compared to the power it uses, but thanks anyways.
peace
Well light loss per range to source is not difficult to calculate.
It goes down exponentially and that means double the range cost your lumens to decrease to a 1/4. Exactly.
However that does not take into acount leaves that shade or other distortions and reflections etc. But from light source to top of the plants it is perfectly accurate and a basic physical fact of nature. Same thing with drag by the way was a racedriver before. Double the speed = quadruple the drag.

Interesting thread by the way man. And ye I am very much into numbers, statistics and calculations myself.

Peace

Puffzter