ive done this to try years ago only with canna veg part 1 and 2.didnt do much .i just but lights out for to days before changing straight to bloom a weak feed first.about a third strenght for first week then into full power with some hammerhead pk13/ 18 really good gear dr hornby full respect!!!also use reganaroot through flower .use ghd ripen to finish and you cant go wrong..let me no if this helps you out peace uk out!!!