I made two diffusers:
a) a room light. stick an LED flashlight under it and it lights up the entire room.
I used a TechLight LumenMaster as a mule for this, and 1 pint of Aerogel grains in
a clear plastic bottle container.
b) diffuser inside the LED light bezel for flood.
used a Mag 2xAA with NiteIze mod, and stuffed grains directly on the emitter
and filled it up to the glass.
Both diffusers barely decreased luminosity, if at all....and had zero artifacts. These work amazingly well.
I used silica aerogel 2nm sphere in 100nm pore clusters, ground up into .1mm-1mm size random grains.
The aerogel is optically pure on the nano-scale, and with all the spheres, pores, and grains...the light really spreads
everywhere perfectly and with absolutely zero artifacts.
I would post pictures but the forum won't allow me to.
Anyone else used Aerogel ? I am not kidding when I say...this might be the -absolute best way- to diffuse LED emitters.