Since most of the fish under docks are small, you don't want to use large flies. I usually dress them on a size 1 or 2 hook. The lighted docks are hot fishing spots because they lure in baitfish - most of which are rarely longer than three inches. The best fly patterns are those that imitate these fish. Bucktail is still my favorite wing material. However, docks often have fly-catching traps, such as hanging wires and pieces of rope. Of course, your nighttime casts aren't as accurate as in the daytime and you can often get hooked on the dock. Most of the flies I throw around lighted docks are small bendbacks. These flies will let you fish with fewer hang-ups.