Lighting agents play a very crucial role. Especially during purchasing, lighting agents facilitate us through their precious advices. Lighting agents provide knowledge to consumers. Lighting is provided by various natural and human-made resources including natural resources (celestial and atmospheric light and terrestrial), combustion, direct chemical, combustion-based resources, electric powered resources (electron stimulated, incandescent lamps, electroluminescent (EL) lamps, gas discharge lamps, high-intensity discharge lamps) and many other resources. There are private and government-funded organizations in the world which are chiefly related with lighting and all the issues related with lighting. Examples of these organizations include Indian Society of Lighting Engineers (ISLE), India, Associazione Professionisti dell'Illuminazione (APIL), Italy, Institution of Lighting Engineers (ILE), United Kingdom, Association de Concepteurs Eclairage (ACE), France, Schweizerische Licht Gesellschaft (SLG), Switzerland, Hellenic Illumination Committee (HIC), Greece and Society of Light and Lighting (SLL), United Kingdom. Fire is a type of combustion lighting. Natural resources of lighting consist of celestial and atmospheric light which includes astronomical objects, sun (sunlight), sunset and sunrise, corona, photosphere, starlight, bright stars, deep sky objects (e.g. accretion discs around black holes, quasars, miscellaneous nebulae), supernova, milky way, zodiacal light (dust found in solar system), gegenschein, atmospheric reentry, meteors, meteor showers, bolides, earth-grazing fireball, sprite (lightning), ball lightning, upper-atmospheric lightning, dry lightning and aurora and Cerenkov radiation etc.
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