In my experience using a thrower to look for something that you do not know where it exactly is, not such an easy task, especially when it moves, or camouflaged, you need a flood so you can spot something that looks out of place, then you use a throwed to light it up and inspect "closer"
Same reason lookouts on ships do not use binoculars, they fan the sea with naked eyes, and if they spot something odd, they use binoculars for a closer look, it is hard to spot something with a limited field of view.