The pictures are pretty much self-explanatory.
Step 1: Scoops.
Step 2: Fitting.
The makeshift diffusers are not suppose to fall out even when the flashlight is hung upside down.
Step 3: Plug and Play.
You can use different colored scoops for different effects and uses.
Red scoops are useful for preserving night vision.
Yellow scoops with blinker warns other motorist of road hazards.