17-1316

tilt during measurement (of a luminaire) [θm]

angle between a defined datum axis related to the luminaire and the horizontal when the luminaire is mounted for photometric measurement

Unit: rad, °

NOTE The defined datum axis may be any feature of the luminaire, but generally for a side- mounted luminaire it lies in the mouth of the luminaire canopy, in line with the spigot axis. Another commonly used feature is the spigot entry axis.

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