I have been using a light mover for some time now. it is amazing, but you are correct, you grow to the foot print and the appropriate application. I have two 3x9 foot prints. I have ran several light setups with optimum environment conditions (temp,humidity,co2,AC,PH, Nuts,Ect). For flowering for me, and my foot print (3x9) it calls for a 600watt HPS for a 3x3 space (1sq meter) My foot print in theory would require 3 600 watt HPS to properly cover the foot print for the recommended light. However because of the light track (5.0 commercial light rail x 2) I cover the foot print with 2 600 watt HPS lights, reducing heat, power and leaf burn as well as getting far better light penetration. So to summarize, I use 2 600 watt HPS to cover a 3x9 area. I currently run 1/4 of the legal limit for my self and my patients. 12 mature plants SOG, each side, typically around 750-850 grams per square meter (3 sg meters x 800 grams= 2400 grams, per side) pretty damn good.

I have also ran 2 300 watt LED, 8/1/1 ratio lights on each size (as they are very comparable) and the yield is slightly less, but you save soo much power, on the watts, the AC and all of the cooling components. No ducting and super quiet. I have been very impressed. when you turn one on they are bright and almost a purple light, but do not look nearly as bright as a 600K HPS or even a good 400 watt MH, but they work and work well. I tested these lights for a buddy because he knows my environment is very dialed in, and he wanted to get a good feel for the lights as in comparison to my HPS, here is the break down; (3 sq meters x 550 grams per meter = 1650 grams per side) so it is less but when you factor in the costs over the months and the fact those fricking LEDS last for like 5 years before you need to replace them it is really a tough call. I was knocking them pretty bad, just because I know HPS are proven if applied correctly. And I now stand corrected and humble on the LED lights. Anyways a honest run and opinion from a HPS guy on the whole LED craze

2 sum it up, more light is not always better, but don't try to over stretch it for the foot print, a light track can not replace light. If you move it though, you can get a 1.25-1.5 longer ( longer only not wider, it is very important) foot print and reduce plant fatigue, burning as well as help penetration and better light angles.

I rarely post on here unless I feel I have some real insight on what I write or comment about.

AG