I'm a little surprised right now. I've just done a very simple power calculation for the strips and something is awry. Assuming each LED claims 60mA at full brightness (probably a little lower if driven at 4.2v?), and there are 18 columns by 7 rows.

This makes 7.56Amps max drain, full white.

Could this display possibly claim 31.7 watts (4.2v) maximum!?

I'm not sure how I came to the conclusion that only two of these buck converters are required if they're only rated at 10w, 2 amps (3 maximum).

Oh well, I guess I shouldn't be driving it at full brightness, but I can get close.

But even for the really modest power requirements of a simple text scroller, my code currently only drives at half the full brightness (R127 G127 and B127 at white) as it's still really bright because of the dark winter right now! I guess I'll stick to only using 50% of the range throughout.

At some point I'll do some real power calculations with a test program and an ammeter.