Heeeeeeeey... I think I was the one talking to you about using Meanwells, and if so I've learned some new information thats kind of important for people like us trying to use LEDs on big setups...
According to Kcress (A major electronics/DIY LED guru in the DIY forum) the reason Meanwell drivers can be so cheap is because they only draw power from the AC sine wave when it is above the voltage they use (48v). Since they are only using a portion of the wave, they have to draw ALL the amperage they will need out of the wall socket at that time causing short bursts of high amperage draw. Under 8-10 meanwells this is not really a problem, but with anything over that it startes causing an electronic phenomena called harmonics that heats up all the wires in that circuit a lot, even the wires in the walls. This can cause your LEDs or other lights on that circuit to flicker and has the potential to start fires....
My new plan is to use Der Wille Zur Macht's DIY driver plan. This is a lot like the buck drivers in that it can only run six LEDs per string and needs an external power supply, but they are extremely cheap to build if you have the skill and can be powered by a single larger power supply. Better and bigger power supplies normally come equipped with a feature called PFC that will prevent the wire heating caused by multiple meanwells.
My LED thread detailing all this (and some PAR numbers) is here:
http://www.reefcentral.com/forums/showthread.php?t=1826521