Im still pretty new here but ill just add my expierence, we have swiched our room up a couple times this past year and the set up now seems to work great. We veg with t5's and a 400w Hortilux blue which has always worked great for us. In flower we have 6 lights in pairs from back to front. The girls start under 2 400w blues, in the middle of the room we have a 600w and 1000w hps and to finish we have a 1000w Hortilux blue and Hps. I really believe that the combination of both lights and spectrums are giving us better results than just running hps in flower. The only swich I can see us make is taking out the 600w hps in the middle of room for the 1000w hps at the finish and replacing that with another 1000w Hortilux blue making the plants start under the blue, moving to hps then back into blue. There are many more factors though, genetics, nutes, soil vs soilless vs hydro. Just hope the more legal it becomes the more actual studies will be done to help us sift through all this bs.