Optimal Orientation of MH Bulbs?

[GMGQ]

My tank is 70gallons, about 24x18x48. My MH lights are about 11 inches above the water surface, so I'm thinking of lowering them at least halfway. While I'm at it, I'm wondering if I should change the orientation of the bulbs/reflectors to get better coverage. What do you guys think about the following configurations?

Currently my 250W MH Moguls + spider reflectors are like this:

Left to Right:


What if I changed them so the tips of the bulbs are facing the front, so that the reflectors cover more area laterally?

Front to Back:


Theoretically it looks like I'll get better coverage from the reflectors. But how much light would actually be reflected, compared to the bulbs running 'along' the length of the tank?: