Actually I think if you're going to full brightness, Adafruit say you should budget for 60mA per LED - so it's 60*50 = 3 Amps.
I can't really work out the specs of the supply you post, but it looks like 6V @ 2500mA from the picture - which is probably not ideal...
However it looks like another slingbox PSU would do it... Or something like this.
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