It is true that King of Sports is Football. Every year, there are thousands of football matches happened all around the world, whether just small size league matches or a big one such as World Cup. In the contribution of a successful match, Light is one of the important factors. Lighting system for football fields must meet the needs from broadcasters, spectators, players and officials. Today, our new blog will be about Lighting requirements in a football field.
Before going to the main part, we need to know clearly what categories of the football competitions are.
Normally, the competitions are divided into five categories (classes). There are two classes that need televised-quality lighting which are CLASS V and CLASS IV. The rest are applied for non-televised events (CLASS I, CLASS II AND CLASS III). We specify the usage and requirement for each CLASS through the table below.
And now, let’s discover which requirements designers should know when creating lighting systems in the football fields.
1. Lux Level and Uniformity Standard
Before designing light in a sport area, designers need to recognize the differences between Horizontal illumination and vertical illumination.
|Horizontal Illumination||Vertical Illumination|
|The way of measuring light reaching||Included: Field camera vertical and fixed camera|
|to horizontal plane, which is around||+ Field Camera Vertical: amount of illumination|
|one meter above the playing surface||the vertical surface, showing some details of players|
|(especially players' faces) during the match|
|+ Fixed camera vertical: above the pitch and capturing|
|the entire play during the event|
Talking about LUX level in the lighting system, there is a great difference between televised and non-televised events. For example, with the class V, football fields’ lighting systems should be equipped with the highest standard level which are 2400 lux for vertical illuminance and 3500 lux for horizontal illuminance. In contrast, those fields for training (CLASS I) need lower level at 200 lux and only use horizontal illuminance.
About Uniformity Standard, it scales from 0 to 1. This parameter is very important because it indicates lumen’s distribution in football fields side to side.
Non - televised Events
U1 is the ratio of minimum illuminance to average illuminance
U2 is the ratio of minimum illuminance to maximum illuminance
2. Color Temperature
Color Temperature describes how warm or cool the light looks like through human eye which is expressed by the unit called Kelvin (K). It normally scales from 1000 to 10 000 K. However, in lighting design, they usually consider kelvin from 2 700K to 6 500K. For more information about Color Temperature, you can check our previous Blog Post “ The Basic of Color Temperature”. In lighting design for football stadium, the general color temperature requirement must be higher than 4000 k for all classes. However, it is suggested that cool white lights (from 5 000 K to 6 000 K) are the most suitable choice as they are more invigorating and give better illumination for players as well as audiences.
When creating lighting system, designers have to take into consideration the size of field, the height, location, number of light poles, illuminance level and uniformity. Then, you start creating the football field by using DIALux (link). While creating the field, you need to remember to draw the light pole with detailed and correct dimensions. The more specific dimensions, the more accurate the results. After that, you can plan the LED flood lights and generating the photometric analysis report.
3. Color Rendering
Color rendering is the way to measure whether a light source can show an object colors realistically and naturally or not. The color rendering index scales from 20 to 100 (the maximum value). The higher the index, the smaller the differences in chromaticities. Conversely, lower values of Color Rendering Index point out that some colors may appear unnatural when illuminated by the lamp. This is the reason why Color rendering index for football field need to be higher than 65 especially in Class V and IV.
Above are all three requirements architects should know clearly in order to meet the demand from the owners. Following them will not only make your customers happier but also develop your skills day by day.