Illumination 2 topics · 2 sources ScienceEnergyThe distribution of light on a horizontal surface. The purpose of all lighting is to produce illumination.US DOE Office of Energy Efficiency & Renewable Energy — Glossary of Energy-Related Terms retrieved 2014-05-26 Cite TechnologyDefenseNon-interfering impingement of electromagnetic energy on Red, Blue, or Gray satellites and Red ballistic missiles in test.DoD Missile Defense Agency — MDA Glossary Cite