ill try and find the link for you and you can have a read, it also had a study on the harvest times, all plants was harvested at same time, well removed from grow room at same time, 1 was harvested same day, 1 was given 24 hours of dark and the other was given 48hours of dark, they sent the buds off for testing and all came back exactly the same results so giving the plants 24 or 48 hours of dark before harvest did not increase trich or thc or cbn, but could be strain related as they only did tests with 3 clones from the same plant grown in same conditions,
the only thing they found was if you harvest the plants before the lights are due to come on then starch levels are lower, so say the plants are under 12-12, if you harvest after the lights have been on for 12 hours then the plant has more starch in the leaves and buds, but if you cut the plant down before the lights are due to come on or harvest as soon as the lights come on as this had lower starch levels in the leaves and buds, i posted a load of info on fuzzy ducks journal about trich production and other info,
ill try and find the site that was running the clone testing and ill put the link up if its not for another grow site, if it was then ill pm you with it,
the only thing i can safely say helps produce more trich is having lower humidity during flower, most of the heavy trich strains that grow outdoors grow in climates that have very low humidity and high temps, so places that make hash have their plants growing in lower humidity due to the climate where they are, so this suggests that lowering the humidity during flower produces more trich, if you search their net for strain hunters cheese, or search or strain hunters kings kush then they give you the best conditions needed to produce the best bud, they give you everything like day and night temps, humidity for veg and flower and they tell you when its best to lower humidity during flower, plus loads of extra info like ec, ph, thc levels throughout the grow, lots of good info but cant post links as they sell seeds from their site, our
sponsors also sell their seeds but cant post links for obvious reasons, but search the net and you will find the vids, using gogle its the top link