Evocation [Light]
Level: Cleric 4, Druid 4, Paladin 4
Components: V, S
Casting Time: 1 round
Range: Long (400 ft. + 40 ft./level)
Area: 80-ft.-radius cylinder, 40 ft. high
Duration: 10 minutes/level (D)
Saving Throw: None
Spell Resistance: No
When you cast battlefield illumination, a soft light illuminates the area. This effect improves the illumination in the area by one category (from darkness to shadowy, or from shadowy to bright light). It does not stack with other magical light effects.
Unlike other spells with the light descriptor, battlefield illumination counters and dispels early twilight but does not affect other darkness spells.
Source: Heroes of Battle, page 125.