I'm playing a Pathfinder game as a Psion, and am considering making some power stones (effectively scrolls) of Control Light. Control Light, unlike Darkness, is a "Concentration" duration power.
Does this mean that I have to maintain the power when I manifest it from the power stone? What if I were using a spell trigger or command word item instead of spell completion?
If there are any relevant differences between 3.5 and Pathfinder, elaboration of them would also be appreciated.