CrossRoads:
P= VV/R = 1010/600 = 167mW disippated by the resistor. What's the issue?
Are you multiplexing this, so only 5 LEDs on at a time? So you only need a 5 *.02A = 0.1A supply.
Or can all 25 be on together and each is individually selectable?
In which case you need a 25 * .02A power supply = 0.5A
(which isn't really a matrix, it's just 25 LEDs arranged in a square).
Well I'm using shift registers so I am not multiplexing.