CANNASIManswered grow question 7 years ago Hey bro as some commented you choose based on your preference, at home i make sleeping aid mainly so I let them go for a wile more, and assure a more couch lock effect, narcotic, here i send you a scheme of the milestones in this matter, note that some Like in-between this steps, you have to experiment and find out your own, checking the trichomes with a magnifying lens. In my case i use atached to the mobile phone camera, a cheap one from amazon.
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A - 40% of hairs have darken, trichomes are half clear and half cloudy : Produces a more energetic effect, and buds tend to still growing in size.
B-50-70% of hairs darken, trichomes are milk / cloudy, you get the most intense high, with most euforia - pain relief vibe.
C- 70-90% hairs have darken, trichomes are major ambar and turning, you get more CBN less THC and a more relaxing / narcotic / couch lock high.
So in my case i go for the C. Hope this adds to your question somehow.
Good luck! Happy growing.