I picked up one of these lights and realized it needed a diffuser. My solution: the cap from a 32 oz. bottle of Gatorade G2. It's an opaque white plastic cap and it snaps over the top of the Task Force flashlight perfectly. There's a rubber gasket around the top of the light that helps hold the cap in place. I think it diffuses a bit too much so I'm playing around with cutting some grooves into the cap with a Dremel. The way I figure it I might as well experiment. Caps are gonna go into the recycle bin anyhow.