Hi. I recently bought (3) Aqua Illumination Hyrda 52 HD lights for my 220. Currently I have (3) MH fixtures. They are mounted to a 2x4 and three metal ropes hold the assembly up that is hung from the ceiling. I have 'j' hooks that I can use to raise the lights durning maintenance. I am looking to do something similar. Below are some questions for LED users... -How high should I mount? My tank is 30" deep mostly sps. -Does it matter if I mount them parallel or perpendicular to the length of the tank? -If this is a Home Depot project, is there any suggestion as to mounting?