My new *correct* power supply came in yesterday, which has both dimming options, voltage and current. I'm not sure which one is the best to use or if it even matters, ...
Right on, so I'll just be dialing the voltage down all the way and then gradually climb until it gets to the brightness I want.
So you're saying I should leave the Voltage dial up to max, and adjust the current to brighten or dim?
OK. There's no meters on the driver so I'd just be eyeballing it. Is that a bad idea? Do I need to get a voltmeter?
... I don't have a way to measure the power output after the dimmer, so I'll have to guess,...
If you can measure the power going into the power supply/driver, then you will have a really good idea of what your output power is.
As you dim the lights, you will draw less from the wall outlet.