https://www.rollitup.org/blogs/blog290-thirty-six-hour-dark-period.html
Jorge Cervantes mentions that other growers "reported" that 36 hours of dark would accelerate flowering, at the top of page 174, of his medical indoor/outdoor bible.
Above is what one grower experienced.
I'm inclined to avoid this method.
When you stray too far from nature's cycle, stress occurs.
This method may speed up flowering by a day, but I doubt the difference is worth the bother.
If Jorge had reported positive results in his own garden, I'd be inclined to check it out.
Exaggeration is pandemic among pot gardeners.
Considering how many indoor gardeners there are, I'm surprised my search didn't find hundreds of comments on this practice.
I'll add more links to this post, if I find them.
http://www.a1b2c3.com/drugs/mjgrow10a.htm#flower
Although he mentions the practice, no details are mentioned. Some other things he mentions makes me question his experience. See what you think.
https://www.rollitup.org/newbie-central/322539-24-36-hours-darkness-before.html
Not much information.
http://boards.cannabis.com/indoor-growing/152925-36-hours-dark-before-flowering.html
Extremely mixed revues.
http://forum.grasscity.com/advanced-growing-techniques/238417-24-36-hours-dark-flowering-harvest-clones.html
Some positive comments, but still nothing quantitative.
http://books.google.com/books?id=fERzFsZhdxYC&pg=PA174&lpg=PA174&dq=36+hours+dark+marijuana&source=bl&ots=t0Uw7tPDQv&sig=xAy0CQ83td_sLvDvrMgQqSs6jl4&hl=en&ei=Wf__S5ngNJCGNs_r2Ds&sa=X&oi=book_result&ct=result&resnum=6&ved=0CDwQ6AEwBQ#v=onepage&q=36 hours dark marijuana&f=false
A shot of page 174 in JC's book. He doesn't claim personal experience, but apparently trusts the information sources.
http://www.420magazine.com/forums/frequently-asked-questions/119661-36-hours-darkness.html
The comments in this thread are the best I've seen. Still no real quantitative info, but some of the positive comments come from people who've done side by side comparisons.
http://www.gardenscure.com/420/harvesting-drying-storage/118732-dark-period-before-harvest-2.html
Some interesting comments...
Is there anybody doing indoor grows that would be willing to do a side by side comparison?
Based on all the comments, it seems most people noticed little difference in potency yield or quickness, but a few reported obvious results.
I guess it is a personal preference.
I veg my plants during Winter hours in a greenhouse, so this isn't very relevant to me, at the moment.
Things are changing rapidly, and sometime in the future, we may be forced to go indoors.
Knowledge is power.