There few ways to stop the glare
1. If it is possible move ur lamp to the side of the gun
2. Depending on what lamp u have u can fit a sunshade style cover over ur lamp if it's a large halogen lamp a flower pot with the end cut off will do the job if its a smaller led lamp a piece of plastic piping with do the job.
I personally don't like the 2 methods I mentioned above
3. what I prefer to do cover the top of the scope lense with a bit of tape you will want to cover about 1/3 of the top of the lense to stop glare I keep a roll of insulating tape in my rifle bag for thi