It's a rare mission that doesn't end up in the dark somewhere, and heroes need a way to see. See Table: Light Sources for the radius that a light source illuminates and how long it lasts.
Table: Light Sources
Item
Light
Duration
Candle
5 feet
12 hours
Torch
20 feet
2 hours
Halogen lantern
40 feet
24 hours
Flashlight
20 feet*
6 hours
*Creates a beam 30 feet long and 5 feet high.
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