You can't miss the water wheel room since the goal is to get both to spin. The four flood lights are also easy to spot and take down since your grapple loves locking on to them no matter where you are in the room. There are two on the ground floor on either side of the water. The other two are located on opposite ends of the room. One can be found on the giant ledge with the turret you use to unblock the first wheel. The second on high ground is next to the spike room in the northwest corner. Firing at them, toppling them over, kicking them all work for this trophy.
Note: If an enemy shoots out a light this still counts.