Welcome to the new forums Guys,
Jakerod, or anyone using the setpos method.. be very careful. Moving existing objects around will muck your map up until you restart OFP. I'd suggest you don't use that method unless you know exactly how to put the object back in the right place (You can't just setpos it back to it's original position).
As for turning on streetlights, you can use the object's ID.
Click on the show ID's button, and zoom in on the map until all these numbers start appearing. Find your streetlamp, and take down it's object ID. Then you can use the line:
(object ID) switchlight "on"
To turn your streetlight on