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Table 3 Sky Brightness (mag/arcsec2) vs. lunar age

From: The growing threat of light pollution to ground-based observatories

Lunar age (days) U B V R I
0 22.0 22.7 21.8 20.9 19.9
3 21.5 22.4 21.7 20.8 19.9
7 19.9 21.6 21.4 20.6 19.7
10 18.5 20.7 20.7 20.3 19.5
14 17.0 19.5 20.0 19.9 19.2