Slomo is basically right there..... I have done it too.... couple steps left out though that might startle ya though... When ya harvest, only take the top half or so of the plant, leave as many fan leaves as possible to help the plant feed and make the reveg a lil easier on the plant.... after a week, to maybe 2 weeks, you will see some fresh new growth coming out of the popcorn buds that you left on the bottom half of the plant, as this growth continues, your plant is gonna drop ALL of the old leaves. NONE of the old foilage will stay on the plant... Kinda startled me when this happened, but when it does that is actually a good thing..... the bud sites will take and start to go crazy with growth.... Veg till ya need and then flip your lights back to 12/12.... Good Luck, with it.... Kinda interesting to do.....