condition mean min max 4 h after light 207.6 207.6 207.6 8 h after light 197.0 195.7 198.3 12 h after light 181.5 176.9 186.1 4 h after dark 153.4 124.5 182.3 8 h after dark 235.2 183.0 287.4 12 h after dark 204.4 195.8 213.0