Quote Originally Posted by curious aardvark View Post
which means what exactly ?

850 watts for a printer is overkill.
but 12 volt should be 12 volt regardless.
If you look for power supplies for led lights you can get some serious power for a lot less than a pc psu. They are exactly the same as printer psu's just cheaper if you buy them from led lighting suppliers.

I have no idea what a rectifier is :-)
It means that the psu has more than 90% efficiency.

Rectifier works like a diode it's used to rectify the electrons. So the electrons only go one way.