It is a common practice to specify a number of fixtures, rather than the amount of sports lighting produced on the field. However, this is like buying a car based on the size of its gas tank rather than its fuel efficiency. The efficiency of reflector systems currently available varies significantly. What you are buying is the quantity and quality of light on the field.
Quantity of Stadium Lights
Light on a playing surface is measured in footcandles. There are several factors that
determine the number of footcandles required to light your field:
1. Sport type — More light is required to light smaller, faster moving objects. For example, baseball uses a small ball traveling at high speeds and, therefore,requires a higher light level than soccer.
2. Players’ skill level — Higher light levels are needed for increased skilland accuracy.
3. Field size — Defines the number of square feet to be lighted.
4. Spectator capacity — More light is needed to see action that is farther away.
5. Television/video requirements (if any) — A camera interprets images more slowly than the human eye and requires more light to be able to follow the action.
What it means: the brightest point on the field should be no more than three times the darkest point. Why is that important? Balls appear to change speeds if they pass from dark to light areas, making it difficult to follow the flight and gauge the speed of the ball. Each manufacturer should provide specific information on initial and maintained light levels as well as a uniformity ratio, so when you compare proposals you can be sure they’re all designed to the same criteria. It’s also a good idea to get written guarantees for both the quantity and quality of light your system will provide.
5 Lighting terms you’ll hear Lumen — A measure of light, much like a mile is a measure of distance.Footcandle — One lumen of light spread over one square-foot of surface. In other words, a light level of 30 footcandles means that 30 lumens of light are being projected onto each square foot of playing surface.
Initial footcandles — The amount of light on the field when the lighting system is first put into use. Target footcandles — The lowest average amount of light for which a lighting system should operate over its extended life to ensure performance requirements.
Constant light levels — The amount of light you can expect on the field at any given time over the extended life of the system. Uniformity — The smoothness of light on the field. Photometrics — The reflector is the photometric unit of a lighting system. It provides a mechanical redirection of light.
High intensity discharge lamp (HID) — A group of lamps consisting of metal halide, mercury, and high pressure sodium. Light loss factor — A factor used to calculate the level of light after a given period of time. Accounts for lamp depreciation, dirt accumulation, temperature and voltage variations, and maintenance procedures.
Point-by-point — A computer-generated model of your proposed lighting system showing footcandle readings at given points on your field. Light levels naturally depreciate over time as lamps age. New technology offse
Maybe you want a LED lighting for you sports venue, please contact us today, you will get a free quote.