Referees and match officials must be able to follow the play in comfort to control the game and make accurate decisions. Last but not least there are the spectators who must get to their place in comfort, see the game in comfort and be able to leave in safety and comfort. These many criteria can be interpreted in the context of available International Codes of Practice of comparable Sports and therefore suitable criteria of illuminance, uniformities and performance can be accorded the many different needs involved. These classes are related to the standards of play and the viewing distances of the spectators. Naturally these different classes do not require either the same quantity or quality of lighting.
Lower standards are clearly acceptable for recreation than for national competition.
Top Level Competition such as National and International Games which generally involve large spectator attendances with long viewing distances. Top level Training is also associated with Class 1. Mid Level Competition such as Regional or Local Club Games which generally involve medium sized attendances with medium viewing distances. High level Training is also associated with Class 2. Low Level Competition such as Local or Small Club Games which do not usually involve Spectators.