condition mean min max 4 h after light 52.1 52.1 52.1 8 h after light 24.95 21.9 28.0 12 h after light 77.2 31.8 122.6 4 h after dark 161.35 101.5 221.2 8 h after dark 135.05 130.4 139.7 12 h after dark 120.55 108.1 133.0