IES Classes of Play I–IV: Designing to the Right Standard
IES classes of play group sports facilities by skill level and spectator capacity, and choosing the right class is the most important design decision — it sets every footcandle, uniformity, and glare target downstream. Get the class right and the rest of the design follows logically; get it wrong and you've either under-lit the venue or wasted a large fraction of the budget before the first pole is specified.
This reference explains what the classes mean, why the class drives everything, and how to design an upgrade path.
What the classes mean
| Class | Use | Demands |
|---|---|---|
| Class I | Professional, major collegiate, broadcast | Highest illuminance, tightest uniformity, vertical/broadcast |
| Class II | Competitive collegiate, high-level club | High illuminance and uniformity |
| Class III | Typical high-school and amateur competition | Competition targets |
| Class IV | Recreational and residential | Lower illuminance, looser uniformity |
As the class rises, footcandles increase, uniformity tightens, and glare and spectator considerations grow stricter. Class I additionally brings vertical-illuminance and broadcast requirements that lower classes don't.
Why the class drives everything
The stakes are large. Two identical fields lit to Class IV versus Class I can differ 3–5× in fixture count and cost. Specify too low and the venue is under-lit for its actual use, disappointing players and failing inspections; specify too high and you overspend on fixtures, poles, and energy the facility doesn't need. The class also determines whether vertical illuminance and broadcast metrics apply at all — a decision that ripples through pole count and structure.
Designing an upgrade path
Many districts build to Class III today but expect playoffs or televised games later. The smart move is to design the poles, foundations, and circuiting to reach a higher class by simply adding fixtures — avoiding the costly re-trenching or foundation re-pouring that an unplanned upgrade requires. The buried, expensive elements are sized for the future class; the fixtures are phased in when needed. Duvon helps owners pick the right class and build an upgrade-ready field.
Frequently asked questions
What are the IES classes of play?
Groupings by skill and spectator capacity: Class I (professional/broadcast), Class II (competitive collegiate/club), Class III (high-school/amateur), and Class IV (recreational). Higher classes need more light, tighter uniformity, and vertical illuminance.
Why does the class matter so much?
It sets every footcandle, uniformity, and glare target — and two identical fields can differ 3–5× in fixture count and cost between Class IV and Class I.
What happens if you pick the wrong class?
Too low under-lights the venue; too high overspends. The class also determines whether vertical illuminance and broadcast metrics apply.
Can a facility upgrade its class later?
Yes — design the poles, foundations, and circuits for a higher class so you can add fixtures later without re-trenching or re-pouring.
How do I know which class fits my venue?
It follows your level of competition and expected spectators; a lighting engineer confirms it before specifying, since it drives every other target.
Not sure which class fits your venue? Ask Duvon's engineers with a free assessment. Get it at duvonlighting.com/free-quote.