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valgusvoo mõõtühik
juhitav täppislaskemoon, mis on võimeline püsima kindla aja vältel ooterežiimis, et sihtmärk leida, tuvastada ja hävitada
valgusvoo erinimetusega SI tuletatud ühiku luumen tähis, symbol of SI derived unit with special name lumen for luminous flux