condition mean min max 4 h after light 1.8 1.8 1.8 8 h after light 2.1500000000000004 1.6 2.7 12 h after light 4.35 4.0 4.7 4 h after dark 8.200000000000001 2.1 14.3 8 h after dark 3.05 2.4 3.7 12 h after dark 4.55 3.0 6.1