Hey eye 1, we are not talking about the same thing. I am giving the formula to compare relative intensities of two lights regardless of the unit of measure you use for distance or intensity. The inverse square law applies regardless of metric or english (dont hate just because i was raised in a backwardass country that uses english units even after the freakin ENGLISH stopped using them lol! Not my fault!
). You are providing some very applied calculations that consider the overlap of multiple lights over a given area, while i am providing a formula by which to compare two lights individually given their intensity at various distances. In other words, i sorta went of on a slightly less applied mathematical tangent, as i am known to do sometimes. Definitely NOT trying to argue with your statements-i was happy to see someone else doing some number crunching too instead of just repeating stuff they read on the internet as most folks unfortunately do. Having expressed my respect, let me emphasize that the formula i entered above is irrefutibly correct, the proof is in the algebra: if e1=L1/d1^2 and e2=L2/d2^2, then e2/e1=(L2/L1)/(d1^2/d2^2) .