Foot-candle   (fc)

Unit of illuminance: lumens per square foot. Sports   lighting horizontal target measured at ground level.

Lux

SI unit of illuminance: lumens per square meter. 1   fc = 10.764 lux.

Lumen

Unit of luminous flux. Total light output from a   fixture.

Candela   (cd)

Unit of luminous intensity. Light output in a   specific direction.

Luminance

Light reflected from or emitted by a surface   (cd/m²). Measured for glare calculations.

Vertical   Illuminance

Foot-candle measured on a vertical plane (typically   at player eye height).

Uniformity   Ratio (Max:Min, Avg:Min)

Brightness gradient across the playing surface.

EPA

Effective Projected Area: the wind-load-relevant   surface area of a fixture.

GR   (Glare Rating)

ANSI/IES glare index for sports lighting. Lower is   better.

UGR   (Unified Glare Rating)

CIE international glare index, used in   FIFA/FIBA/World Athletics.

BUG   Rating (B/U/G)

IES TM-15 rating: Backlight / Uplight / Glare. U=0   is full cut-off.

Full   Cut-Off

Optical geometry emitting zero light at or above   90° from nadir. BUG U=0.

Indirect   Asymmetric

Optical strategy redirecting light across the   playing surface rather than projecting it downward.

Beam   Distribution

Angular pattern of fixture light output. Narrow /   medium / wide.

CRI (Ra)

Color Rendering Index. 0–100 scale; higher better.   CRI ≥ 80 standard sports.

R9

Red rendering specifically. ≥ 50 NCAA broadcast; ≥   80 FBS / pro broadcast.

TLCI

Television Lighting Consistency Index.   Camera-specific rendering.

TM-30   (Rf, Rg)

IES TM-30 modern color rendering: fidelity (Rf) and   gamut (Rg).

CCT

Correlated Color Temperature. 5000K–5700K standard   for sports.

MacAdam   Step

CCT consistency unit. Step 3 = broadcast tier; Step   5 = recreational acceptable.

L70

Hours of operation at which fixture maintains 70%   of initial lumen output.

MTTF

Mean Time To Failure. Driver lifetime metric.

Flicker   Percentage

LED brightness variation at line frequency. <   0.3% broadcast tier.

Flicker   Frequency

LED on-off cycle frequency. > 5,000 Hz   broadcast; > 25,000 Hz slow-mo.

TLM-30

IES temporal light modulation measurement standard.

THD

Total Harmonic Distortion. IEEE 519 limit < 20%   standard.

IES RP-6

Illuminating Engineering Society Recommended   Practice for Sports and Recreational Area Lighting

NFHS

National Federation of State High School   Associations

NCAA

National Collegiate Athletic Association

FIFA

F&eacute;d&eacute;ration Internationale de   Football Association (international soccer)

FIBA

F&eacute;d&eacute;ration Internationale de   Basketball

FINA /   World Aquatics

International swimming federation

ITF

International Tennis Federation

USTA

United States Tennis Association

USAP

USA Pickleball

ICC

International Cricket Council

BCCI

Board of Control for Cricket in India

BAA /   BABA

Build America Buy America Act (federal funding   domestic manufacturing requirement)

DLC

DesignLights Consortium (LED qualification for   utility rebates)

DLC   Premium

Higher-tier DLC qualification; required by most   utility rebate programs

DarkSky   International

Dark-sky compliance certification body (formerly   IDA)

USDA RD

USDA Rural Development (federal loan/grant program   for rural infrastructure)

EECBG

Energy Efficiency & Conservation Block Grant   (DOE funding program)

HMGP /   BRIC

FEMA Hazard Mitigation Grant Program / Building   Resilient Infrastructure

CDBG

Community Development Block Grant (HUD funding)

LEED

Leadership in Energy and Environmental Design   (building certification)

AASHE   STARS

Sustainability Tracking, Assessment & Rating   System (university sustainability)

SBTi

Science Based Targets initiative (carbon target   verification)