basicly your are creating stress to get it to produce natural hormones that will in effect give you more crystals but also slows the plant down for a lower yeild. there is a product you can foliar spray on the plants that gets them to give you the same effect but with no stress so more crystals with the same vigorious gowth like normal. harpin protien is what you are looking for it activates the plants natural sar defense system. I have been messing with it the last few grows and seen some pretty dramatic increases in resin. the product is called messenger its by eden bio science its cheap $3 a pack and that is enough for a crop.