I found the light bleedback from my Lightforce filter was unacceptable when night hunting. My solution was to find a round plastic margarine tub a bit smaller than the inside of the filter to use as a mask, (any round container or lid will do). I placed the rim centrally inside the filter on a flat surface and sprayed the inside of the fixing claws and internal border, (short bursts or the paint will run), with semi-matt black paint and allowed it to dry completely for a few hours, don't rush it. I put the mask on the front of the filter and sprayed the outside. You end up with the fixing claws and border covered in black paint which blocks out most of the light bleedback from the lamp. It does get scratched with use so needs painting again from time to time. Hope this is useful!!!!!!!!.