Design Baseball::

Baseball is a high speed multi-directional aerial sport. Proper illuminace levels an light direction are critical as the ball may travel at over 130 miles/hour. In flight, the baseball may be momentarily not visible from direct glare from light sources. Proper pole location and floodlight insure good player and spectator visibility. Requirements for the field depend on the type of play,

Class I - Facility with OVER 5000 spectator capacity
Class II - Facility with UNDER 5000 spectator capacity
Class III - Facility with SOME spectator capacity
Class IV - Facility with NO spectator capacity

SPORT	LIGHTED AREA	CLASS OF PLAY	HORIZONTAL		UNIFORMITY
SPORT	LIGHTED AREA	CLASS OF PLAY	LUX	FC	CV	Max:Min
Baseball & Softball	Infield	I	1500	150	<=0.07	<= 1.2:1
	Outfield	I	1000	100	<=0.13	<= 1.7:1
	Infield	II	1000	100	<=0.10	<= 1.5:1
	Outfield	II	700	70	<=0.17	<= 2.0:1
	Infield	III	500	50	<=0.17	<= 2.0:1
	Outfield	III	300	30	<=0.21	<= 2.5:1
	Infield	IV	300	30	<=0.21	<= 2.5:1
	Outfield	IV	200	20	<=0.25	<= 3.0:1

Horizontal illuminance - is a measure of the lumens per unit area on a horizontal surface. Normally it is measured 3 feet above the playing surface.
Uniformity illuminance - is 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 - is a measure of illuminance weighted to the spectral sensitivity of the human eye. It is defined as 1 lux = 1 lumen/square meter.
FC - footcandle. The official definition is 1 footcandle = 10.764 lux, however it is easiest to approximate at 1 footcandle ≈ 10 lux.

Design considerations for optimal light levels to avoid glare and keep uniformity(see image below:)

fixture

Typical Pole Layout for a Softball/Baseball field, Each line represents the light ray from one luminaire(see image below):