Does anyone have specific recommendations for a light to use as a lantern?

I have a good headlamp for hiking/camping/etc, but I’d like a little flashlight to use as a backup/as a stationary lantern around camp. I’ve never used a diffuser on a flashlight, so I’m not sure if they are all created equal, or if some are better than others. Momentary brightness isn’t that important to me, but decent efficiency, a red light, and light weight are important. Bonus points for using 18650 since that would make it compatible with my headlamp.