I have no idea where your light switch is in relation to you motion sensor. Can the light be turned on without the motion going active? In a situation like that, I'd use Wait for Expression instead of Event. It'll look at the state instead of waiting for a discrete event that may not happen anytime soon.
My general rule is if the trigger and the wait are looking at the same device then Wait for Event is fine. If they aren't the same then Wait for Expression is my preference.
