I finally got around to doing this mod on a few of my lanterns. I got Rustoleum frosted glass spray from Home Depot.
I modded 3 lanterns: Brunton 3C Polaris, Coleman Retro 11W rechargeable fluoro, and Favourlight warm white 3AA. While I really like all three, each had issues with glare that I thought could be improved.
And what an improvement! I love it. The big Retro 280 lumen can now be used without wanting to avert your eyes. Big thanks to upchuck for suggesting this mod. The Polaris and Favour are now easier on the eyes as well for close range.
Now, I'm looking for a similar mod that can also apply a warmer tint... ideas?