I cracked my frosty lens on my sc600 a few months ago, did nothing about it, and continued to abuse the light... Eventually the whole pressed in bezel and cracked glass fell out in my pocket. Fortunately the reflector didn't get too scratched up. I use the light daily as an automotive mechanic, and dont really have a practical back-up light....so... I cut a 26.5mm x 1.5mm lens out of a new replacement welding helmet outer lens (polycarbonate?) and pressed it back into place. I now have a clear lensed sc600fd III plus xhp50 light. I do like the new slightly narrower beam spread better, but.... well... I guess a picture is worth a thousand words
I dont notice the donut hole in the beam, unless im lighting up a white wall, but there it is, the artifact.
Just thought I'd share exactly why not to put a crappy clear lens in a light that wasn't designed for it!