Vertical Illuminance Design for Ball Tracking & Broadcast
Vertical illuminance — light on a vertical plane rather than the ground — is what lets players track a ball in the air and cameras capture clear images. Ignoring it is why some fields meet their footcandle number yet still play and film poorly. It's the metric that separates a field that looks bright underfoot from one that's genuinely good for fast aerial play and television.
This reference distinguishes horizontal from vertical illuminance, explains why broadcast lives on vertical light, and describes how it's designed in.
Horizontal vs vertical
Horizontal illuminance lights the surface — the grass, the court, the ground. Vertical illuminance lights what stands up from it: players' faces and bodies, and the ball in flight. A high fly ball, a lob, or a serve travels through the vertical plane, and a camera framing players against the field sees the vertical plane almost exclusively. The two are different measurements with different design implications, and a great field needs both.
Why broadcast lives on vertical light
If vertical illuminance toward the camera is low or uneven, faces are shadowed and the ball lacks contrast — even when the ground is brightly lit. The picture looks flat and the action hard to follow. That's why broadcast design specifies vertical footcandles toward each principal camera position, with its own uniformity target. A field designed only to a horizontal number can pass its play standard and still produce a poor broadcast.
Designing for it
| Lever | Effect on vertical illuminance |
|---|---|
| Lighting from multiple directions | Reduces single-direction shadows on players and ball |
| Appropriate aiming angles | Builds even vertical light across the plane |
| More poles (6–8) | More aiming points = even vertical illuminance |
Vertical illuminance is built by lighting from several directions at appropriate angles, which reduces the single-direction shadows a sparse layout produces — one reason higher classes of play use 6–8 poles rather than fewer. Duvon's Vanguard and Apex deliver the high, even vertical light broadcast demands.
Frequently asked questions
What is vertical illuminance?
Light on a vertical plane — players' faces and the ball in flight, which is what cameras see. It governs ball tracking and broadcast image quality.
How does it differ from horizontal?
Horizontal lights the surface; vertical lights what stands up from it. Aerial play and cameras depend on the vertical plane.
Why can a field meet horizontal targets yet fail on broadcast?
If vertical illuminance toward the camera is low or uneven, faces are shadowed and the ball lacks contrast even with a well-lit ground.
How is vertical illuminance achieved?
By lighting from several directions at appropriate angles, which is why higher classes use 6–8 poles to build even vertical light.
Do recreational fields need vertical illuminance?
Less so — they're often designed mainly to horizontal targets. Vertical illuminance becomes critical for competitive aerial sports and any filmed venue.
Spec a vertical-illuminance design with a free certified photometric study. Get it at duvonlighting.com/free-quote.