well going more darkness later on in flowering does work not sure about loss of yield i started changing my lighting schedule last 2 weeks or so from 12 / 12 to 11 1/2 lights on 12 1/2 off then after week to 2 weeks went 11 hrs light on and 13 off
just have to mimic fall as you get more in to fall theres more darkness so doing it is a good idea lights on you lose THC from transpiration , lights off it replenishes it and so on thru flower lights on you lose some when lights off it replaces it and adds more thc and so on through out flowering stage