What happens if you do not calculate horizontal and vertical lux values before installation?

What is horizontal and vertical lux and what is it used for? We will cover some of these questions in our weekly blog post. Our focus is stadium lighting regarding larger clubs whose matches are shown on TV. Calculation of these values are extremely relevant to avoid e.g. shadows who interfere both players and the audience.

The only way you can be sure of an appropriate level of light in your design, is to measure these values before installation. It is calculated in lux, and tells you how much light illuminates a given surface.

Typically, there will be two types of lux values you need to calculate for sports lighting:

Horizontal definition Measured on a horizontally positioned hypothetical surface.
Vertical definitionMeasured on a vertically positioned hypothetical surface.

The big difference between horizontal and vertical lighting is the specification of the location and orientation of the surface. In addition, calculating vertical lux can have different directions, including vertical toward camera and audience.

Why should horizontal and vertical lux be calculated?

Calculation of these values is important to take into account when installing a new lighting solution for some types of stadiums. The illuminated area at different places on the field must be visible to audience, TV viewers, cameras and players. Typically, any person, equipment, ball or similar will create a shadow and can affect the players ability to play. By measuring both vertical and horizontal lux helps to equalize the level of light, creating a more homogenous brightness and minimizing shadows.

When is this relevant?

Vertical is usually only required when it comes to profiled lighting installations where matches are broadcast on TV in HD or 4K cameras. In leagues at a lower level, vertical lighting is not used because these matches do not appear on TV regularly. It will increase the project’s lighting cost. However, you need to take these calculations into consideration if we are talking about stadium lighting a higher level.

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