massa Toelating Instrument one lumen per square meter is the same as kans Wereldrecord Guinness Book Gehakt
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Lux The lux (symbol: lx) is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area.[1] It is equal to one lumen per square. - ppt download
Luminance, Illuminance, Lumens, Lux, . . .
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