Hey all,

First to do a 20hr day, all it takes is a recycle timer that is capable of 10-12 hrs on and 10-8 hrs off. Sentenial DRT-1 is capable of this.
The real pain in the butt is you need to have the fexiblity to tend your plants while the lights are on, and that is constantly changing.

Next try to understand that when we talk about "light stressing" a plant, it's interrupting the dark period...with light. Changeing a plant's photoperiod, when done correctly will not stress the plant. When a plant is in vegative mode, lenghten or shorten the photoperiod (lights on) time to what you want, while the lights are on. When a plant is in flower mode, lenghten or shorten the dark period (lights off) to what you want, while the lights are off. This can be done all at once, no need to gradually change it. No light stress involved. In fact, trying to change photoperiods gradually, you are more likely to screw up.

While I understand, most people here are hobbyists and not in it for the money....growing does cost money...and time is money. Plus the 20hr day routine I told you abt was just food for thought or to get you to do some mental masturbation.

As to a plant's homeostasis or as some might call it's cicadia rhythm, plants in general and mj in particular are very adoptive. The "enviorment" we are talking about here is indoors, and the gradual light changes of outside natural light really don't apply. We are already using light schedules that take advantage of the fact we know mj is a "long day plant" and we can control how long it will veg. And we control when it will flower, and even have a bit of control over when it will finish.
OM