The entire area of a Sports field should be uniformly illuminated.
Recommended illuminance levels are:
Class I (100 fc. / 1,000 lux.): Professional sports (Stadium and Arena)
Class II (50 fc. / 500 lux.): Semi-Professional sports (Amateur Leagues / High School)
Class III (30 fc. / 300 lux.): Training facilities
Class IV (20 fc. / 200 lux.): Elementary school