Nothing but HPS will tend to make plants tall and spindley. I would substitue 2 of those for MH, and you could expect more bushy plants. Better yet have 3 MH and one HPS for veg, and the other way around for bud.
Opie Yutts Reviewed by Opie Yutts on . is 4 600 watt lights enuff? I have a Hydrohut delux and have put in 4 600 watt lights. They are hortilux HPS lamps. I have heard/read that you want at least 50 watts per sq ft and/or 2000 lumens per sq ft. The HH is 32 sq ft. By that estimation I am at 11,000 lumens per sq ft. and 75 watts per sq ft. I have grown pretty good plants but density is still not good or at least not as good as I would like. I heard that a product called phosphoload by DM might help with this but I am not sure. Rating: 5