Im working on my first grow, and im still in the educational phase. I understand that MH bulbs are best for the veg. phase, and HPS are best for flowering. There will be 4 plants under a 600w hps for flowering, but im not sure about the MH for vegging. Should the wattage be the same as the HPS. Also, Are there fixtures that can take both hps and mh bulbs, and I can just swap them when the time comes? If not, I may have to use flourscent for veg, cuz I really cant afford to buy a whole seperate fixture.