I haven't checked into the kessil fixture much, but i assume it uses some sort of reflector or lens. From what i have observed, most LED emmiters with no reflector drop off PAR values by about 50% in a pattern that looks like an equilateral triangle. So at 6" down from the light, 6" offset, PAR would be cut in half of what it is directly under at any given distance. Keep in mind this is just a pattern i have observed when looking at bunches of PAR readings on various fixtures, one of these days i'll get my own meter and to a bunch of experiments.
LED Lighting Compendium
Originally Posted by Ludwig van Beethoven
Don't only practice your art, but force your way into it's secrets, for it and knowledge can raise men to the divine.