While illuminance quantity and quality are critical, illuminance uniformity, direct glare, and reflected glare are also very important. A typical playing area for a single tennis court is 60 by 120 feet. However, for a Class I or II facility, the oval court area may be as large as 80 by 150 feet. For illumination design purposes, the oval court surface may be subdivided into the primary playing area and the secondary playing area.
STADIUM CLASS DESIGNATIONS
✔ Class I – Facility with OVER 5,000 spectator capacity
✔ Class II – Facility with UNDER 5,000 spectator capacity
✔ Class III – Facility with SOME spectator capacity
✔ Class IV – Facility with NO spectator capacity
✔ Horizontal illuminance – a measure of the lumens per unit area on a horizontal surface. Normally it is measured three feet above the playing surface.
✔ Uniformity illuminance – a measure of the rate of change of illuminance expressed as a ratio between the illuminance level of adjacent measuring points on a uniform grid. The limit of uniformity varies with the speed of the ball.
✔ LUX – a measure of illuminance weighted to the spectral sensitivity of the human eye. It is defined as 1 lux = 1 lumen/square meter.
✔ FC – foot-candle. The official definition is 1 foot-candle = 10.764 lux; however, it is easiest to approximate at 1 foot-candle ≈ 10 lux.