Mars Hydro tsw replaces around 450w hps, what little you lose in total power output you will gain dramatically in spectral configuration suited for the growth of particular plants, a single tsw2000 can push the central plants into 1950 ppar which is at the top of the curve, photosynthesis levels just taper right off after 2000 photon flux per m2, these lights will really push your plants to the absolute maximum so long as the other 8 cardinal parameters are met the sky is the limit. I would personally keep the HPS with higher blue until the worst of the stretch is over and really try and keep those internode spacings tighter then switch to the far reds, the IRs on the hydro will cause some excessive stretching which in turn will get you longer thinner colas, IR and far-red indicate to the plant it is under the canopy of another plant and will tell it to grow vertically rapidly, in my big fat colas nugs require short tightly woven internodes, we only want that hormonal change of reds to really kick in once the plant no longer grows vertically and no new fan leaves form. Good luck brother/sister, toke ON!@