Not sure if you guys have seen it or not but Black Gold has a sight out this year that has a clear plastic cover over the wrapped fibers. In low light conditions it remains clear for maximum brightness but when exposed to sunlight the plastic automatically darkens, reducing the brightness of your pins and eliminating the halo effect. Its a pretty cool idea and from what I've seen works well. I can't for the life of me remember what the name of it is, or find it online anywhere. Maybe someone else can help in that dept.