i dont know about others and dont seek to speak for them but the general trend that i have seen is to use a high pressure sodium- HPS for flowering and MH for for vegg..
but the MH might work for you i read somewhere that it helps to produce tons of trichromes and such to make potent but not very heavy buds as 'red' light is needed for flowering to take place.. well not really needed but it helps a lot!!
hope this helps
-J