In professional sports lighting, achieving sufficient horizontal illuminance on the playing surface is only part of the lighting equation.
For international competitions, broadcasters, players, officials, and spectators also need to clearly see the front and sides of athletes, the ball, and other moving objects. This is where vertical illuminance becomes critical.
A football pitch may appear bright when measured from above, yet still produce poor visual conditions for players and cameras if vertical illuminance is insufficient.
So, what exactly is vertical illuminance?
Why is it important for professional sports?
And how can a stadium lighting system achieve the required vertical lighting performance?
Let’s take a closer look.
Table of Contents
Horizontal illuminance measures the amount of light reaching a horizontal surface, such as the playing field.
It is commonly expressed in lux (lx).
For example:
Horizontal Illuminance: Light reaching the field surface.
However, athletes and cameras do not only see the field surface.
They need to see objects that stand vertically above the field — including:
This is where vertical illuminance comes into play.
Vertical Illuminance: The amount of light reaching a vertical plane, measured in lux.
Imagine placing a vertical measurement plane in front of a player. The light falling onto that plane represents the vertical illuminance available for that viewing direction.
In professional sports lighting, vertical illuminance is commonly evaluated in different directions because cameras and spectators may view the playing area from multiple sides.
This is one of the most common misunderstandings in sports lighting.
A lighting system can provide high horizontal illuminance while still producing inadequate lighting on the vertical surfaces of players.
Why?
Because light distribution is directional.
Consider two different lighting scenarios.
Most of the light is directed toward the ground.
The pitch surface is bright.
Horizontal illuminance:
High
But the front of a player may receive significantly less light.
Vertical illuminance:
Insufficient
Light is distributed onto the playing surface while also illuminating players from appropriate directions.
Horizontal illuminance:
High
Vertical illuminance:
High
The result is a more complete three-dimensional lighting environment.
This is especially important for professional competitions and broadcast applications.
One of the biggest reasons professional sports venues pay close attention to vertical illuminance is television and digital broadcasting.
A television camera does not simply capture the grass.
It captures the players and the ball against the background.
If the vertical surfaces of players are poorly illuminated, cameras may struggle to capture sufficient detail.
This can result in:
This becomes particularly important for modern sports broadcasting.
Professional cameras increasingly capture sports at high frame rates and high resolution.
Whether it is:
4K → 8K → HDR → High Frame Rate
the lighting environment needs to provide sufficient and consistent illumination for the camera system.
This means that lighting quality is not simply about making the field bright.
It is about making the entire sports scene visually readable.
The same principle applies to the ball.
A football, baseball, tennis ball, or volleyball is a three-dimensional object moving rapidly through space.
If the lighting primarily illuminates the ground, the ball may become difficult to track when it moves away from the field surface.
For example, in football:
A player kicks the ball high into the air.
At that moment, the ball is no longer close to the horizontal plane of the field.
Its visibility depends much more heavily on the surrounding three-dimensional lighting environment.
This is why professional sports lighting must consider:
Field → Player → Ball → Camera
rather than focusing only on the field surface.
There is another important relationship:
More light does not automatically mean better visibility.
A stadium lighting system can produce high illuminance while still causing uncomfortable glare if light enters the player’s or spectator’s field of view at inappropriate angles.
This is particularly challenging in high-mast stadium lighting.
A luminaire may need to project light:
This creates a fundamental design challenge:
Therefore, professional sports lighting needs to balance:
Horizontal Illuminance
Vertical Illuminance
Uniformity
Glare Control
Spill Light Control
Traditional floodlights often rely on relatively broad beam distributions.
While this can illuminate large areas, it may also send unnecessary light outside the target zone.
Professional sports lighting requires much more precise control.
The optical system needs to determine:
Where should each lumen go?
For a stadium project, different luminaires may need to illuminate different zones of the playing area.
For example:
The optical distribution can then be designed to create overlapping beams.
This approach helps create a more balanced lighting environment while maintaining the required vertical and horizontal illuminance.
A football stadium is not a simple rectangular room.
The distance between a luminaire and different points on the field can vary significantly.
If every fixture uses the same beam distribution, some areas may receive excessive light while others receive insufficient light.
This can lead to:
Bright Zones → Dark Zones → Uneven Lighting
Professional stadium lighting therefore often uses multiple optical distributions.
Depending on the fixture and project requirements, beam angles may be selected according to:
The objective is not simply to maximize lumen output.
It is to achieve precise light distribution across the entire venue.
Vertical illuminance should not be treated as something checked only after installation.
It needs to be considered during the lighting design stage.
A professional sports lighting design typically evaluates the interaction between:
Luminaire Position→Optical Distribution→Aiming Direction→Target Area→Horizontal Illuminance→Vertical Illuminance→Uniformity→Glare
This is why professional lighting simulation is so important.
Using photometric data such as IES files, engineers can simulate how each luminaire contributes to the overall lighting environment before installation.
For stadium projects, lighting simulation can help engineers optimize:
Even a high-performance sports floodlight cannot deliver its designed performance if it is aimed incorrectly.
This is especially important for high-mast installations.
A small aiming error at a high mounting height can move the light distribution significantly away from its intended target.
As a result:
Incorrect aiming
→ Poor uniformity
→ Insufficient vertical illuminance
→ Excessive spill light
→ Increased glare
→ Uneven player visibility
This is why professional sports lighting projects often require on-site aiming and commissioning.
After installation, engineers can verify the actual lighting conditions and adjust the luminaires according to the final site conditions.
For stadium owners and project managers, vertical illuminance should not be viewed as simply another technical specification.
It directly affects the overall usability of the venue.
A properly designed lighting system can support:
Better visibility of the ball and surrounding players.
Improved visual recognition of player actions and ball movement.
A clearer and more comfortable viewing experience.
More consistent illumination of players and the playing area.
A lighting system designed around the actual requirements of the venue rather than simply maximizing installed wattage.
| Lighting Parameter | What It Measures | Why It Matters |
|---|---|---|
| Horizontal Illuminance | Light reaching the playing surface | Field visibility and overall playing-surface brightness |
| Vertical Illuminance | Light reaching vertical planes | Player, ball and object visibility |
| Uniformity | Distribution consistency | Reduces bright and dark zones |
| Glare | Visual discomfort caused by excessive luminance/light in the field of view | Player, spectator and camera comfort |
| Spill Light | Light extending beyond the intended area | Environmental and neighboring-area control |
The important point is:
A professional sports lighting system must be designed as a three-dimensional lighting environment.
Not simply a bright field.
In stadium lighting, higher wattage and higher lumen output do not necessarily guarantee better lighting performance.
What matters is how effectively those lumens are delivered.
The goal should be:
That means directing light precisely toward the areas where it contributes to:
while minimizing:
This is the fundamental difference between simply installing floodlights and designing a professional sports lighting system.
For professional stadium projects, MECREE focuses on the complete lighting system rather than the luminaire alone.
Our sports lighting solutions combine:
Purpose-designed beam distributions help direct light toward specific areas of the playing field.
IES photometric data can be used for project-specific lighting calculations and simulation.
Luminaire quantity, beam distribution, mounting positions and aiming directions can be optimized according to the stadium structure and competition requirements.
After installation, luminaires can be precisely aimed and adjusted according to actual site conditions.
Optical design, shielding and aiming strategies help control unwanted light and improve visual comfort.
From luminaires and control systems to lighting design, installation guidance and commissioning support, MECREE provides an integrated approach to professional sports lighting projects.
When discussing stadium lighting, it is easy to focus on one number:
How many lux are on the field?
But professional sports lighting is much more complex.
Players do not see a flat horizontal plane.
Cameras do not record the grass alone.
The ball does not remain on the ground.
Sports happen in three-dimensional space.
That is why vertical illuminance matters.
A well-designed stadium lighting system must deliver the right amount of light:
On the field.
On the players.
On the ball.
Toward the cameras.
And away from unwanted areas.
Ultimately, professional sports lighting is not about producing the most light.
It is about delivering the right light, in the right direction, at the right intensity, with the right level of uniformity and glare control.
A stadium can look bright to the human eye and still fail to deliver broadcast-quality lighting. ...
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