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Lamps. Lamps classification Lamp Incandescent discharge Low pressure high pressure Mercury Sodium Metal halide lamps
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Luminous Source produces its own light eg. the sun, a light bulb, a camp fire, a firefly Non-Luminous Source: does not produce its own light
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lamps
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The Zebrafish are emitting light when exposed to ultraviolet light. Salton Sea in California has algae that emit light giving it this glow
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