IES RP-6 Sports Lighting Standards: A Complete Engineering Reference

The foundational standards reference for facility designers, electrical engineers, athletic department directors, and procurement teams specifying LED sports lighting in the United States. Covers IES RP-6 classes, foot-candle and uniformity targets, photometric requirements, and how to apply the standard across sports.

IES RP-6 (formal title: Recommended Practice for Sports and Recreational Area Lighting) is the underlying technical standard for almost every US sports lighting specification. It defines five illumination classes, sets foot-candle and uniformity targets by sport and play level, specifies photometric deliverables, and is the document permitting authorities and sanctioning bodies cite when validating compliance. This guide is the standards reference for any project where IES RP-6 will be specified.

What IES RP-6 Is and Isn’t

IES RP-6 is a recommended practice published by the Illuminating Engineering Society (IES). It is not a code, and it is not legally binding by itself. Its authority comes from being:

·The reference standard cited by sanctioning bodies — NCAA, NFHS, USTA, USA Pickleball, and others reference IES RP-6 in their facility standards

·The technical document permitting authorities cite for sports lighting projects requiring photometric validation

·The framework utility rebate programs and federal funding agencies use to evaluate whether a project meets “industry standard” performance

Specifying to IES RP-6 protects the project against permit revisions, sanctioning denials, and funding agency rejections.

The Five IES RP-6 Classes

Class I is approximately 4× the illumination of Class III. Class III is approximately 2× Class IV. The geometric scaling reflects camera and player visual demand at each tier.

Foot-Candle Targets by Sport and Class

IES RP-6 publishes foot-candle targets by sport and by class. Selected targets:

These are averages. Point minimums must not fall below 50–60% of average per IES RP-6, and uniformity ratios are specified separately for each class (see below).

Uniformity Ratio Requirements

Class I’s ≤1.3:1 average-to-min target is the tightest in any general sports lighting standard. Tight uniformity is what produces a clean broadcast image and consistent visual experience for athletes.

Vertical Illuminance: The Standard’s Most Overlooked Requirement

IES RP-6 explicitly requires vertical illuminance modeling for sports where ball trajectory carries it above the playing surface (baseball, softball, tennis, soccer, football kicks, lacrosse, cricket). Required:

·Vertical illuminance grids at multiple heights (typically 30, 60, 90 ft for baseball/softball; 0–15 ft for soccer; 30+ ft for football kicks)

·Vertical FC targets that scale with class (typically 60–75% of horizontal at the same class)

·Continuity of vertical illuminance through the active play envelope

A photometric study that omits vertical illuminance grids has not validated the design against IES RP-6. This is the most common compliance gap in budget bids.

Glare Rating (GR)

IES RP-6 specifies a Glare Rating (GR) calculation per ANSI/IES standards. GR is calculated at viewing positions across the field (player eye height, spectator positions, broadcast camera positions) and quantifies disability and discomfort glare from the lighting system.

GR calculation must appear in the photometric study deliverable. Bids without GR validation have not validated against IES RP-6.

BUG Rating Requirements

IES RP-6 references the IES TM-15 BUG (Backlight, Uplight, Glare) rating system to characterize fixture spill and dark-sky behavior. Sports lighting fixtures should target:

·Backlight (B): B0–B2 for residential-adjacent installations

·Uplight (U): U0 (full cut-off, mandatory for dark-sky compliance)

·Glare (G): G1–G2 for sports applications

Specifying U=0 BUG is the engineering path to dark-sky compliance and protects against permit revisions and HOA review issues.

Photometric Study Requirements

IES RP-6 treats the photometric study as part of the design standard, not an optional deliverable. Required:

·AGi32 (or equivalent) layout with horizontal illuminance grid covering full play surface

·Vertical illuminance grids at appropriate heights for the sport

·Uniformity ratios (max:min and avg:min) committed for the design

·Aiming diagram for the install crew, fixture-by-fixture, with tilt and azimuth

·Glare Rating (GR) per ANSI/IES standards

·Property-line spill calculation for permitting

·Bill of materials matched 1:1 to modeled fixtures

How to Specify IES RP-6 in a Bid

Standard bid language for IES RP-6 compliance:

“Lighting design shall comply with IES RP-6 (Recommended Practice for Sports and Recreational Area Lighting), Class [I/II/III/IV/V], for [sport]. Photometric study deliverable shall include horizontal and vertical illuminance grids, uniformity ratios committed at the modeled values, aiming diagram for installation, Glare Rating (GR) per ANSI/IES standards, and property-line spill calculation. Fixture BUG rating shall be U=0 (full cut-off) at minimum.”

This language protects against bidders cutting corners on the photometric deliverable or the fixture spec.

IES RP-6 vs Sport-Specific Standards

For most sports, IES RP-6 is the foundational reference, and sport-specific governing-body standards layer additional requirements on top:

·Football — IES RP-6 + NFHS + NCAA + ESPN/CBS production specs (broadcast)

·Soccer — IES RP-6 + FIFA + NCAA + USL/MLS production specs

·Baseball — IES RP-6 + MLB + MiLB + NCAA + NFHS

·Tennis — IES RP-6 + ITF + USTA + ATP/WTA

·Pickleball — IES RP-6 + USA Pickleball + MLP

·Cricket — IES RP-6 + ICC + BCCI + ECB

·Motorsports — IES RP-6 + NASCAR + IndyCar + NHRA + IMSA

The sport-specific overlay typically refines color rendering, flicker, broadcast specs, and venue-specific glare control. The IES RP-6 base specifies the general framework.

For sport-specific standards application, see Football, Soccer, Baseball, Tennis, Pickleball, and Cricket guides. For photometric engineering, see AGi32 Photometric Engineering.

Specifying to IES RP-6? Request a free 24–48 hour AGi32 photometric study with full IES RP-6 compliance package →

Frequently Asked Questions

What is IES RP-6?

IES RP-6 (Recommended Practice for Sports and Recreational Area Lighting) is the technical standard published by the Illuminating Engineering Society that defines foot-candle targets, uniformity ratios, vertical illuminance requirements, glare rating calculations, BUG rating thresholds, and photometric study deliverables for US sports lighting projects. It’s the foundational reference cited by NCAA, NFHS, NFHS, USTA, USA Pickleball, and most US permitting authorities.

What are the IES RP-6 classes?

IES RP-6 defines five classes: Class I (highest-tier broadcast: MLB, MLS, NCAA D-I FBS, FIFA Cat A/B), Class II (mid-broadcast: MiLB, FCS, USL, NCAA D-II broadcast), Class III (HS varsity, NCAA D-III, club competition), Class IV (HS sub-varsity, youth competitive, Little League), and Class V (recreational, training, public parks). Each class specifies separate foot-candle, uniformity, and vertical illuminance targets by sport.

What uniformity ratio does IES RP-6 require?

Class I: ≤1.5:1 max-to-min, ≤1.3:1 average-to-min. Class II: ≤1.7:1 / ≤1.5:1. Class III: ≤2.0:1 / ≤1.7:1. Class IV: ≤2.5:1 / ≤2.0:1. Class V: ≤3.0:1 / ≤2.5:1. Tighter uniformity at the broadcast tier supports clean camera images across long focal-length panning shots.

Does IES RP-6 require vertical illuminance modeling?

Yes. IES RP-6 explicitly requires vertical illuminance modeling for sports where ball trajectory carries it above the playing surface (baseball, softball, tennis, soccer, football kicks, lacrosse, cricket). Required at multiple heights with vertical FC targets that scale with class (typically 60–75% of horizontal). A photometric study that omits vertical illuminance grids has not validated against IES RP-6.

What is Glare Rating (GR) under IES RP-6?

Glare Rating is a calculation per ANSI/IES standards that quantifies disability and discomfort glare from the lighting system at viewing positions across the field. GR <40 is acceptable for broadcast-tier competition. GR 40–50 is acceptable for general competition. GR >60 is non-compliant. GR calculation must appear in the photometric study deliverable for any IES RP-6 specification.

How do I specify IES RP-6 in a bid?

Standard language: “Lighting design shall comply with IES RP-6 (Recommended Practice for Sports and Recreational Area Lighting), Class [I/II/III/IV/V], for [sport]. Photometric study deliverable shall include horizontal and vertical illuminance grids, uniformity ratios committed at the modeled values, aiming diagram for installation, Glare Rating (GR) per ANSI/IES standards, and property-line spill calculation. Fixture BUG rating shall be U=0 (full cut-off) at minimum.”