Im looking to get one of the various models of the titan light controller and i was wondering if anyone could tell me whats the difference i notice they have one that plugs into a 120v socket but operates at 220v? and they have others which say 120v and operate a ballast (240v) at 120v? also is there any wiring involved or is it just plug and play. and from what i ca read i was thinking i should go with the titan helios 2 cause its already prewired with a 120v plug but i know someone here has to use it so give me some info please and stop me from making a mistake