Thanks that sequence helps me, I googled EV > Lux conversion and found the formula:
Lux = 2.5 x 2^EV which covers of the exponential part of the equation. Then I recalled a post from a photographer that carried the Lux to Lumens conversion by simply using a constant as a multiplier (I guess what rdrfronty also referred too) so that his formula ended up effectively being:
LUMENS = C x (2.5 x 2^EV), where “C” is simply a plug multiplier derived from a known calibration light.
The formula I’ve played around with is:
LUMENSt = LUMENSc x [2^(EVt - EVc)], where “c” is calibration light and “t” is the tested light.
This formula works with the link above, and also the first Wikipedia chart on the same subject. Algebra is Algebra I guess….
Thanks for the help folks!
(edit… if anyone is still interested, be happy to discuss the ambient sampling method…)