Valgusti esimene fotomeetriline telg ei pruugi ilmtingimata kokku langeda C,γ - koordinaadistiku polaarteljega, kui valgusti on fotomeetrilistel mõõtmistel kaldu.
The polar axis of the C,γ - coordinate system does not necessarily coincide with the first axis of the luminaire if the luminaire is tilted during measurement.
