If you don't have a bench supply, a mastech 3010 will run 7 reds, hard. You'll need something similar to get the leds matched up so they run efficiently, so I'd start with that. It's really the foundation of your system.

Mean Well PLN 60-12's are the best bang for the buck. At 12V, the 100 watt PLN's spec out real closely; almost double the price. :wtf:

Need to power 6 reds? Use 2 60-12's, 3 reds on each.

Up to 8 reds? 3 or 4 on each driver.

9 reds? You'll need 3 60-12's, so back to 3 leds per driver.

And so on. The smaller groupings you break your leds into, the closer you can match them up. Different voltages will cause individual leds to draw different amounts of current. And we want them all pulling the same current--1.2 A, or thereabouts....So we "bin" them into little groups that will behave the same way at each given supply voltage.

Hope that's making sense. I just re-read it and I'm not sure how clear it is unless you understand the idea already...

I 'splain better if it's not clear. Ain't hard. Jes' ask.