What do you find this cold treatment does other than color changes?
also, i believe the weight of the resin also contributes to a heavier yield had you not done the cold treatment, from experience i have found this to be somewhat evident. i grew a cross of pre 98 bubba and trainwreck from a few years ago, i grew out about 4 clones from a mother, i did 1 plant with the cold treatment and 1 without, both had about the same conditions and training, they were all to have 5 main colas, including the top bud. both looked as if they would yield similarly, the one in cold treatment had denser, more resinous buds. i did this cold period for about 72 hours, and tried to keep temps at about 63-65 degrees.
i have recently heard its good for preserving the THC, it has been proven by a study that the dark period is good since THC can be destroyed by light, another reason why we also cure in the dark.
people argue "But this doesn't happen in nature?", well this is sort of the point, so you can stress it to put out this resin and preserve its THC at the same time, without the sun destroying what THC still exists on the bud. unlike how mother nature would intend for plants to grow, survival is their final goal but in nature, their goal is to carry on their species, even if it means to hermaphrodite to continue the species, but we want sensamillia, seedless crop with the most potent part of the bud or flower preserved, which would be the THC. we do these methods to enhance the plant, you dont see hydroponic systems in nature either but they grow much faster than soil grows.