LED light build

[Milad]

Im with mseepman,
dont to a ton of 60-48Ds, you will start a fire, and its more expensive. get an HLG version

48 XR-E are closer to the 250w MH
For your other builds I would suggest getting the XP-G CW and XP-E RB
And if you want to get really fancy get XM-L CW instead

and for heatsinks, for a big build, I would also suggest aluminium u-channel. It works fine and its cheap at your local hardware store. you just have to put fans on it to. What you will find is that your 72in fixture because a huge big piece of heatsink that you will have trouble hanging over your tank.

for connecting to your APEX I would wire a rj-45 jack to your project box in a way that you can just plug in a cat-5 patch cable and control both colors. makes it easy.