I'm really not trying to bait you or anyone. I can only share what I know from personal experience Stoney Bud. My first discovery of the power or stress with growing marijuana was purely by accident. In the late 90's I grew at a remote location with a hydro setup all automated on timers. My partner and I had to go out of town for the holidays and when we got back to the garden we were very disappointed to see that a breaker had tripped and the plants had gone without food or light for almost a week and the temps were in the 50's. The plants were late in week 5 and were dried up beyond the point of no return. But, they were covered in trichs, much more than that strain had ever produced before by that point in their bloom and much much more than was usually produced in a week. Although the buds weren't developed properly the combination of these stress factors piled on the goo and it was pretty decent to smoke. I didn't know how to replicate the situation and keep my plants healthy until harvest so I filed that knowledge away for several years.
Around 2004 I was frequenting some forums that had a lot of BC growers contributing. A few of the more knowlegible growers started posting their experiments with using a combination of a darkness period, thirsty plants, and night temps in the upper 50's during the dark cycle. We gave it a go. We harvested plants at a couple stages for comparison. They were all the same strain. We harvested one plant on the same day we put the other plants into darkness, we also harvested a plant that stayed under a 1K light for the additional 3 days while the others stayed in the dark bloom room for 72 hours. We also had some nicely cured buds of the same strain from our previous run, grown under the same conditions and nutes but without a darkness period before harvest. The plants that had been exposed to the dark period had slightly more trichs, about 20% more ripe amber trichs and more depth of flavor in the cured end product. Over time I've noticed that some strains amber up more than others in darkness. I don't do A/B tests anymore as I accept that it works and I'm sure that even with my limited knowledge of proper botany, stress must have a lot to do with it.
Peace!