condition mean min max 4 h after light 6595.6 6595.6 6595.6 8 h after light 7835.0 7084.0 8586.0 12 h after light 8011.35 7915.7 8107.0 4 h after dark 10379.65 7381.9 13377.4 8 h after dark 11402.8 11271.8 11533.8 12 h after dark 10473.1 9988.2 10958.0