budding mj plants love the dull orange glow of the hps more than any other lighting imo. but for veg the blinding white light of the mh is by far the best lighting. i use flouros for veg myself to conserve power so that way i can use more hps wattage to flower. i did use a 400 conversion bulb for veg 1 time rather than the usual flouros and the plants grew 5x faster under that mh than flouros but i just couldn't justify the extra energy expense as i did not need the plants to grow that fast. i grew an 8-9 week strain so there was plenty of time to veg clones while i had a crop flowering. i personally wouldn't veg with hps or flower with mh but that's just me, imo the best lighting set up would be a mh for veg and dual spectrum flowering, meaning using both mh and hps together. in the space i have available(2ftx4ft for veg 4ft7inch x 4ft7inch for flower) i would ideally like to use a 400mh for veg and a 1kw hps + 400mh for flower. and thats my $.02