tilt in application (of a luminaire) [θf]

angle between a defined datum axis on the luminaire and the horizontal when the luminaire is mounted for field use

Unit: rad, °

NOTE 1 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.

NOTE 2 This is the actual tilt of the luminaire when it is mounted for field use and should not be confused with "tilt normal in application" or "designed attitude" (see CIE 121- 1996).

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