Paphiopedilum
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Lux
Luminous efficiency function
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Flashlight
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Delayed sleep phase disorder
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Olympic-size swimming pool
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Exposure value
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Lighting
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Kruithof curve
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Film speed
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Light meter
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Exposure (photography)
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Daylighting (architecture)
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Gamma correction
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Physical security
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Stage lighting
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Printmaking
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Caesium standard
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Venus
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Television
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Sunlight
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SI derived unit
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International System of Units
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General Conference on Weights and Measures
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Charge-coupled device
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Apparent magnitude
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Ampere
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