Light and Darkness
Light is very important for Heroes to navigate the complexities of a dungeon.
In the Darkness heroes suffer -2
on Skill Checks, Defense and Attack rolls
Light Levels
From dimmest to brightest: Moon Light, Dim Light, Early Dawn Light, Day Light, Bright Light, Burning Sunshine. See Prismatic Light for the full effects of each level -- Torch and Candle both produce Dim Light, Lantern produces Early Dawn Light, and only Prismatic Light (on a strong roll) reaches Day Light or above.
Items that Produce Light
Spells that Produce Light