As you can see their are a few benefits to vertical lighting, Number 1 The majority of the heat produced by the HID is pushed upwards to your exhaust vs the horizontal hood that traps heat and directs it at your plant's. The main advantage to this is that you can put your plants closer to your bulb's without worrying about burning them, 1 grower I know can get his plants up to 6" from his 1000w bulb but keeps them back a few more inches due to the buds getting bleached from to much light!!
Number 2 The next benefit vertical growing is that you will be using 360o of your light, you want to absolutely cover the outer diameter of the bulb with plants so barely any light can escape, this will give you the best efficiency you will be blasting your plants with as many lumen's as possible. Compare this method to a horizontal garden, if you look at the diagrams you can see that a massive 75% of the light is reflected thus killing a lot of lumen's in the process lumen's that I'd prefer getting to my plants, and after all less lumen's = less yield and we don't want that now do we!
Benefit Number 3, This next benefit is for space, the amount of space you save by growing is phenomenal, a 600w lamp would be fit for a 4X4 area at very most, and even this is only a low 37.5 watts per square foot. compare this to a vertical set up, you could have a vert system 3 foot in diameter but 8 foot high and fill it with 300 plants have 10 of these in one room......ya get the idea? If not here is a pic to explain the major benefit of space improvement.
As you can see you would be improving your space by 135%! That's a huge increase.
Here is another diagram that you shou
Right well according to this chart the maximum distance you can get your plants to your 1000w hid is 10 inches, this will blast 64,000 at them compared to 44,000 at 12 inches, that's a BIG drop for only 2 inches. How far do you keep your plants from your bulb?
Another benefit of this system is that you can slow down the stretch on plants, this is very handy for growers wanting to grow sativa's that have a 3 x + stretch. In some of the v-scrog grows I've come across it would seem that when you stop raising the light the plant responds by cutting it's stretch and focus more of it's energy in bud production which is real handy I think you would agree


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