DIY AGRAMOVER

Hey, I have the option of customizing a grow tent for a 20'x 24' room... Im going to build a 15'x 20' grow tent (dimensions are subject to change) and I have recently been researching Light Rails, and Agramovers (which are just "industrial" strength Light Rails)...
I have discovered that since theyre a relatively "new" concept, that there's not too terribly much information out there.... Aside from distributors touting their efficacy, and relative science behind them.. I have found few testimonials...
The way that I understand it (thus far) is that the moving light subsidizes the use of more stationary lights by covering a larger area with essentially the same amount of PAR, and distributing lumens equally (though not constantly) across the canopy... thus allowing you to have fewer lights, more plants, in a larger area... (I know you cant substitute the amount of lights by THAT much by having them be mobile) but there in lies my dilemma.... HOW MUCH?
I have not been able to find any templates, or real guidelines on setting up mobile lighting to absolute efficiency/ efficacy...
I hae heard a few say that if you increase the light spaca/ footprint 2fold (from 4x4 to 4x8) that your outer plants may suffer, and not recieve as much light...

I am making a custom Grow Tent (from wholesale material/ + PVC) so the dimensions are up to me... and Im trying to grow 75 plants with 6 1000W MH/HPS (and 2000W CFL equally distributed throughout)

My question is... how much running space can I get out of each light (which will ultimately solidify my tent dimensions) I have thought of two configurations that might work... but really I am worried that I dont have enough light...

120,000Φv x 6 = 720,000 Φv / 75 plants = 9600Φv per plant
720,000Φv / 300(2) (15' x 20') = 2400Φv per ft(2)....

(I realize that measuring luminous flux Φv{Lumens} and
luminous intensity Iv {Candelas}
is not the most accurate way to measure the amount light waves emitted... but its a helpful template to reference the amount of µmol you obtain through PAR)

So with 6 stationary lights, staggered throughout my grow area I will produce 720,000Φv which is 7200Φv per meter(2) without (reflectors/ supplementals)
which is pushing it....
So in short... Im just wondering the overall distributable efficacy of making my lights mobile (i.e how long can I make my tracks without losing light on a specific are of my plant??)

I can either do it this way or this way
\/ (widthwise) \/ (lengthwise)

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Any knowledge or suggestions would be greatly appreciated
Thanks