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XLamp CXa2520 LED

6-inCh DownLight

REfEREnCE DEsign

of Cree, Inc. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree Sales at sales@cree.com.

Importance

Characteristics

units

critical

Luminous flux (steady‑state)

lumens (lm)

Efficacy

lumens per watt (lm/W)

luminous distribution

color uniformity

Form factor

Important

price

$

manufacturability

lifetime

hours

operating temperatures

degrees (°C)

operating humidity

% relative humidity

Correlated color temperature (CCT)

K

Color rendering index (CRI)

100-point scale

ease of installation

table 2: some ranked design criteria for an LED downlight

Luminaire type

Luminaire Efficacy (Initial)

EnERgy stAR REquIREmEnts

Luminaire minimum Light

Output (Initial)

Luminaire Zonal Lumen

Density Requirement

Downlights:

•

recessed

•

surface

•

pendant

•

SSL downlight retrofits

42 lm/w

≤ 4.5” aperture: 345 lumens

> 4.5” aperture: 575 lumens

luminaire shall deliver a minimum

of 75% of total initial lumens within

the 0‑60° zone (axially symmetric

about the nadir)

table 3: ENERGY STAR luminous efficacy, output and zonal lumen density requirements

Characteristic

Requirements

Light source life requirements:

all luminaires

The LED package(s) / LED module(s) / LED array(s), including those incorporated into LED light engines or

GU24 based integrated LED lamps, shall meet the following L70 lumen maintenance life values (refer to Lumen

Maintenance Requirements in the next section):

•

25,000 hours for residential grade indoor luminaires

•

35,000 hours for residential grade outdoor luminaires

•

35,000 hours for commercial grade luminaires

Lumen maintenance life projection claims in excess of the above requirements shall be substantiated with a TM‑21

lumen maintenance life projection report.

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ENERGY STAR® Program Requirements, Product Specification for Luminaires (Light Fixtures), Eligibility Criteria, Version 1.2,

www.energystar.gov/ia/partners/product_specs/program_reqs/Final_Luminaires_V1_2.pdf?7b7d‑2473