I have 8 blubs total.
2 x 54w 48" bulbs in the back
6 x 80w 60" bulbs towards the front
They are all offset, so the outer 18" get a little less light as the center 54" of the tank. Works out well that way ... Favias are happy now in the less intense lite up area.
These are the same lights I ran on my 150g, minus the 2 x 54w bulbs ... And I had some stuff bleach untill I moved it out of the light.
My acros are all over!
My lr really only goes up to 1/2 way up the tank, and my sps are in the middle to top region, some near the bottom 1/3 of it ... On a 30" deep tank ... So for a 24" deep tank, my stuff would be in the bottom to middle area.
My power bill is $150 for a 3,000 sqft house (2,100 sqft under air), with AC set to 75*F, a well, and whole house RO system (3 x 220v pumps) ... My tank costs me around $50 a month ... I couldn't be happier.
Do I have 3" of growth on my sps every month like some people that run 3 or 4 x 400w MH, dose $50 - $100 a month in additives .. Etc. ... I enjoy my tank, much more knowing that it costs very little for the size.
My entire tank consumes just under 1000w / 1kw at peak time ... Some with tanks this size consume 1200w for their MH alone, then add in VHO supplementation ... 4 or 6 x 96w VHOs?!
As others have said ... There is not a single right way to skin a goat ... Its a preference thing.
If you really want the shimmer lines, go with MH.
Will you get better growth with MH? Maybe.
Will you have a higher power bill? YES!
Not only do the MH bulbs draw more watts, but you also create heat that you may need a chiller for to cool your tank back down, but your house AC unit will also run more.
--marco