Most characters cannot see much without light. Some night conditions (those for the outdoors) are given in Table 62. But all of these assume some small amount of light. In totally lightless conditions, normal vision is impossible, unless a source of light is carried by the party.

Light sources vary in the area they affect.
Table 63 gives the radius of light and burning time for the most common types of light sources.

Of course, while a lantern or fire enables characters to see, it does have some disadvantages. The greatest of these is that it is hard to sneak up on someone if he can see you coming. It is hard to remain inconspicuous when you have the only campfire on the plain, or you are carrying the only torch in the dungeon. Furthermore, not only do creatures know you are coming, they can generally see you before you see them (since the light source illuminates the area around you, those outside this area can see into the area). Characters should always bear these risks in mind.

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