Control Light

Control Light
Psychokinesis (Light)

Manifesting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Area: Nine 10-ft. cubes + three 10-ft. cubes/level
Duration: Concentration, up to 1 min./level, or 1 round; see text
Saving Throw: None
Power Resistance: No
Power Points: 1

By manipulating the ambient light level, you can decrease or increase the illumination of an area. The change in illumination can be gradual (taking as long as 1 minute) or sudden (occurring immediately when you manifest this power). You can alter the level of illumination from its original level at any time during the power’s duration.

Decrease: You can decrease the illumination of an area by as little as 5% (barely perceptible) or as much as 100% (total darkness). If you decrease the light by 50% or more, the visual ability of creatures that depend on light to see declines accordingly. For instance, a human carrying a torch can see well out to 20 feet. If you use control light to decrease the illumination around him by 75%, then the area he sees as brightly lit by the torch extends only out to 5 feet. If you decrease the ambient light in an area by 100%, even those with lowlight vision are unable to see within the affected area. For each 25% decrease in ambient light, characters in the area gain a cumulative +1 circumstance bonus on Hide checks (to a maximum of +4 when all the light is gone).

Increase: You can increase the illumination of an area by as little as 5% (barely perceptible) or as much as 100%. If you increase the light by 50% or more, the visual ability of creatures that depend on light to see improves accordingly. For instance, an elf carrying a sunrod can see well out to 60 feet (because of her lowlight vision). If you use control light to increase the illumination around her by 50%, then the area she sees as brightly lit by the sunrod extends out to 90 feet. You can use this power to increase the illumination of an area by 200% (improving visual abilities accordingly), but in such a case the power’s duration is only 1 round.

Source: Expanded Psionics Handbook