The bulbs were covered by a blue-tinted lens. They were located about half way out along the wing just ahead of the aileron, inboard of the middle aileron hinge. Here is a color picture that isn't very distinct.
Here is a picture of the underside of the wing.
And finally, here's the underside of the wing of a restored Bearcat with what looks like a blue lens exactly where if appears in the wing in the above pictures.
I wrote "some" F8Fs because on a high-resolution copy of this picture of an F8F-2 taken during a Grumman acceptance flight, there is clearly no light installation on the outboard wing panel. Note however that there is still a white "recognition" light on the top of the fuselage just ahead of the dorsal fin.
For more on U.S. Navy airplane exterior lights, see https://tailspintopics.blogspot.com/2016/03/exterior-lights.html