See also my post about modifying the SC31pro, in case you want to try TIRs:
Addition to that: I recently tried the frosted TIRs from Convoy and I am not too keen on those, too much loss of light as i feel when using them but also you can see how much goes backwards (towards the housing) from using the light without the front ring on. I would recommend the pebbled TIRs from 10-45 degrees, I haven’t tried the flat clear ones yet.