the whole harvest in section thing is kind of bunk, if you look at the plant usually what you will see is that the bottom buds...while under-developed are actually the first ones ripe i tried this on my last grow because the plants were so bushy i thought it would work but the results were sorry, just a bunch of over mature little scraggle buds, you would be better off raising the short plants up closer to the light to even up the canopy and maybe adding your light up there, generally speaking you want to focus the energy of the plant to the tops because thats where your fat growth will be concentrated so i fyou start adding lights at the bottom then it comes at expense of the tops, just something to think about ya know