[chuckz]

Anyone done much experimenting with this?

I've been thinking...

Nature relies on a regular event (sun rising) to guide the rhythm, and the natural changes to the photoperiod happen gradually.

I've noticed when reversing photoperiods (taking outdoor cuttings into the growroom, and vice versa), that a period of shock tends to occur, which stunts the plants for up to a week.

So I am also wondering what shock occurs by switching suddenly from 18 or 20 hours to 12 or 13? Would it be better to keep the 'dawn' stable, the middle of the 'day', or 'dusk'? Or better still to perhaps reduce it by an hour a day, taking half hour off each end?

Comments or informations, anyone?

[British_Hempire]

I don't think changing the photoperiod of indoor plants induces much stress, it takes a while for the plant to make the hormonal changes that occur in the transition from veg to flowering, so all I think would happen if you reduced photoperiod gradually would be that those hormonal changes take longer, delaying the onset of flowering.