You can do the entire grow with one bulb.

Yeap... that's right... from veg to flower with MH.
Or, from veg to flower with HPS.

It is *better* to use MH for veg, then change to HPS for flowering.
It is *even better* to use both MH and HPS for flowering.
It is *even even better* to use both MH and HPS for both veg and flowering.
It is *even even even better* to use the full spectrum of the sun.

If you have to pick one bulb for your grow, I believe it's a 'general consensus' (w/e) that an HPS bulb would be the one to have.

Peace
turtle420 Reviewed by turtle420 on . Light question Hi all well right now im using cfls to grow but i am trying to upgrade to 430 watt hps...Now my question is can i use the hps for the whole grow veg and flower or do i need a mh bulb for veg n hps for flower?And if anyone can hook me up with the cheapest place to get these lighting systems would be helpful cuz im on a bit of a budget...thanks all Rating: 5