A lighter is a drainable item with various uses.
A lighter can be used to light candles, molotov cocktails, cigarettes, campfires, or antique ovens, burn corpses, or as a light source. In order to use a molotov, a lighter must be equipped in the secondary slot of the inventory. Corpses can be burnt if a lighter is in the primary slot and a gas can is in the secondary slot.
The light provided by a lighter is inferior to that of a flashlight, but will provide a ring of light around the player. If a flashlight isn't in the player's inventory, pressing the 'F' key (default) will equip a lighter and turn it on. Once equipped, pressing 'F' will turn it on or off.
Lighters can be found in many counters and on vehicle glove boxes and seats.
From items.txt (Project Zomboid directory/media/scripts/)
DisplayCategory = LightSource,
LightDistance = 2,
Weight = 0.1,
Type = Drainable,
UseWhileEquipped = TRUE,
TorchCone = FALSE,
LightStrength = 0.4,
DisplayName = Lighter,
ActivatedItem = TRUE,
Icon = Lighter,
MetalValue = 1,
cantBeConsolided = TRUE,
StaticModel = Zippo,
WorldStaticModel = ZippoGround,
ticksPerEquipUse = 110,
Tags = StartFire,
||Added to the game
|All light sources are a bit stronger
||Burn zombie corpses ! It'll need some petrol and a lighter/matches.
||Bug Fix: lighter can't be consolidated