when i was a kid we used to put a shoplite on the river, i mean like on a rock shinning in the river and watch the fall fish at night shoot buy, it never stopped them or looked like it bothered them, and it seemed every other night a steelhead would come to rest in the light until it got railroaded by some chinook shooting buy. The best night my fishing buddy had at a night fishery for steelhead is when he dropped his maglite overboard and it shinned straight up at him all night, he caught 4 fish???