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<span class="link_user">@CANNASIM</span>, Thanks !
Let see... First I start with 24/0 on seedling and vegetation (in this diary, 4 weeks)... then, when all plants have shown pistils on preflowering, I change to 20/4 (around week 5). First weeks on flowering (when the flowers are developing in length) I keep 20/4 until the flowers stop increasing their length and start increasing their volume (in this diary, week 8). At this point I switch to 18/6 and keep it that way until flowers stop increasing their volume and start ripening, moment where I switch to the final 12/12 cycle which in this diary is exactly today, on week 10.
I prefer that way because of many factors, among them: reducing electricity billing, doesn't affect the yield that much due to the scaled and late switch, increase the potency of the buds (light breaks THC) and slow the unnaturally-fast flowering of some autos (improving quality). So far it has been worked very well :)
Now, I am going to feed one more time the girls and then start flushing for 2 weeks on a 12/12 light schedule. Then, 48 hrs before harvest I will turn off all lights to remove the remaining nutrients from the buds and speed the drying process.
<span class="link_user">@Bstoner</span>, Thanks !
The change is mainly due to the belief that even though autoflowering strains control their hormones by age and not by light schedule, the balance between florigen and antiflorigen can be influenced by longer periods of darkness. Basically, we are telling the plants that days are getting shorter and they need to hurry. Until now, there have been two "flowering spikes" just before the changes from 24/0 to 20/4 and from 20/4 to 18/6 so they are getting the message.