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lumens lux candela measurement concept. 3d illustrator..
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lumens
lux
illumination
light
candle
candela
eye
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education
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flat
fluorescent
halogen
icon
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infographics
infrared
intensity
isolated
kelvin
lamp
led
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night
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realistic
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source
tungsten
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book
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university
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computer
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learn
young
business
indoors