nurk valgusti esimese fotomeetrilise telje ja valgusti jalgpunkti (nadiiri) läbiva sirge vahel tasandis (fotomeetriline asimuut C = 00, C = 900), kui mõõtekalle on null
angle the first photometric axis of a luminaire makes with the nadir of the luminaire in the plane C = 00, C = 900 when the tilt during measurement is zero
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