The size of a sports facility and the distance at which spectators are viewing also decide the lighting class or level required for the sport.
Lighting Levels required for exterior sports fields are lower than the indoor sports courts. This is because the exterior adjacent spaces to courts are darker during nighttime. Hence, they provide good adaptation levels for the sports being performed.
The principal playing area is the main playing area inside the court marking. The total playing area is the total area that covers both the principal playing area plus the additional safety area inside the court boundary fence.
Glare is a crucial factor for sports field lighting designs. CIE 112 talks about the Glare evaluation system for outdoor sports and area lighting
CIE 112 specifies glare rating factor (GR) ranging from 10 to 90 on the evaluation scale. The lower the GR value, the better the visual perception for the players.
Generally, a maximum GR value of 50 is specified for sports courts.