in railway yards. Colored light is occasionally useful for hunters tracking wounded game after dusk, or for forensic examination of an area. A red filter helps preserve night vision after the flashlight is turned off, and can be useful to observe animals (such as nesting loggerhead sea turtles) without disturbing them.

Detachable light guides, consisting of rigid, bent plastic rods or semi rigid or flexible tubes containing optical fibers, are available for some flashlights for inspection