condition mean min max 4 h after light 1.5 1.5 1.5 8 h after light 5.95 5.7 6.2 12 h after light 1.7000000000000002 1.6 1.8 4 h after dark 3.1 2.7 3.5 8 h after dark 12.05 2.8 21.3 12 h after dark 3.35 2.2 4.5