The lighter automatically activates at night, providing a source of light. It is held in the right hand and picking up an item, such as the knife, will not cancel this effect.  It never runs out of fuel, making this a good basic light source, and allows navigation by map and compass at night (although this may be considered unwise).

A torch , campfire , lantern , candle or bunsen burner each casts much greater light, but has a limited duration.