Originally Posted by
mechBgon
Try putting a piece of typical frosted "invisible tape" across the end of the flashlight, but not against the glass, just in open air. I recall that this turned my Fenix L2D into a super-flood beam. I don't have any invisible tape here at home, or I'd post photos of that.
What would actually be pretty good would be to get a fresnel lens, like one of the pocket magnifiers, the kind intended to put in a wallet, and cut a piece to go over the lens. That should spread the beam really well. It would be ideal to fix it so that there wasn't much of a collar in front of it, but even back a bit it should help a lot.
A light spatter coat of clear krylon on the front of the glass might help too.