condition mean min max 4 h after light 4540.4 4540.4 4540.4 8 h after light 4566.25 3815.4 5317.1 12 h after light 4817.9 4477.7 5158.1 4 h after dark 4646.1 3928.1 5364.1 8 h after dark 6081.65 3905.2 8258.1 12 h after dark 7644.9 7360.9 7928.9