mh is the fuckin shit for your foliage/ veg stage.
i used 400w mh only for around 1 1/2 months and had 32" females the males were even taller than that.
as soon as i switched out to Hps 400w everything stop growing and went into shock for about a week and still now (2 weeks later) the leaves are all limp unlike with the mh they stuck out like they were in electric shock.
I wish my hps would do for the buds what the mh did for growth