indirect illumination

Related to indirect illumination: direct illumination

indirect illumination

Battlefield illumination provided by employing searchlight or pyrotechnic illuminants using diffusion or reflection. a. Illumination by diffusion: Illumination of an area beneath and to the flanks of a slightly elevated searchlight or of pyrotechnic illuminants, by the light scattered from atmospheric particles. b. Illumination by reflection: Illumination of an area by reflecting light from low cloud. Either or both of these effects are present when a searchlight is used in defilade or with its beam spread to maximum width.

Dictionary of Military and Associated Terms. US Department of Defense 2005.

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References in periodicals archive ?

The lighting consists of a ratio of 70 percent direct and 30 percent indirect illumination, which reduces glare when the cafeteria is used for a training session or meeting.

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-- Indirect illumination -- engineers can now introduce more accurate light effects into their designs, ensuring that light reflects properly off different geometry and scene backgrounds and illuminates areas previously left in the dark;