as an aside, with a headlamp or flashlight, one can make an effective light diffuser using some opaque white packing foam type stuff and an elastic to hold it in place. Make a sort of dome shape over the light source and or including a piece of white paper as a reflector and while not perfect, its fairly easy to get a nice diffused light source for inside a tent or at a picnic table.
The bigger the "dome" or thereabouts shape, means a larger diffuse lighting source.
both foam packing and paper and elastic don't really weigh anything, so worth playing around with trying it out at home.
I used to work doing photography lighting, so specifically thinking all the time about how to modify light, and this is a pretty effective way to diffuse a directional harsh beam.
Or, <insert drum roll to build suspense>, use a piece of Scotch tape over the lens.
The PFD light I use has no focusing lens, emits light over a hemisphere shaped area.