valgustuspaigaldise kogu teatava aasta kestel tarbitava elektrienergia ja kogu valgustuspaigaldise poolt valgustatava pindala jagatis
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Ühik: vatt-tund ruutmeetri kohta, Wh.m–2.
total electrical energy consumed by a lighting installationthroughout a specific year in proportion to the total area to be illuminated by the lighting installation
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