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Apostilb (někdy též Blondel) je starší jednotka jasu v soustavě CGS. Odpovídá jasu dokonale rozptylující desky o ploše 1 m², která vyzařuje světelný tok 1 lumen. Jednotka byla zavedena v Německu, od roku 1978 by ale neměla být používána. Alternativní název Blondel (podle André Blondela) byl v Německu používán v letech 1942-1948.
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jasu m² blondel jednotka německu lumen cd sb někdy též starší soustavě cgs odpovídá dokonale rozptylující desky ploše vyzařuje světelný
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