When installing these Aveo Andromeda Aurora lights, do I need power packs, and a switch installed just to turn on the strobes?
Per the manufacturer, absolutely NO power packs. A power pack will fry the lights. The lights can be wired such that just the strobes come on or so all the lights come on. For more details, please review the Installation Manual we have added to the "Documents" tab of this web page.
Is the power & current quoted under the Specifications tab (e.g. Power - strobe (peak Watts): 45 W) for one light assembly or for the pair?
Yes, the Watts stated are for the pair of lights.