If you will check out the pics I posted in "O.k. to flower with both HPS & MH" you will see that I got FAT and not excessively leafy buds off a 1000 MH. I read in "Indoor Grower's Bible" that you can expect to see about a 15% increase (all other things being equal) when flowering with HPS instead of MH.

Grow Big! and stay home.