So, I bought this grid to increase the directionality of light coming form my 60" octa, a requirement it satisfied handily. A nice (to me) side effect, that I should have thought of was the fact that it also eats up some light. Consequently, I can shoot a little less stopped down, or at more than 1/4 power on my monolight. While I'm not getting the exact results I want, I think that is more due to my lack of familiarity, and the fact that my strip box is MUCH better suited to the results I wSee full review