Four-foot Linear Replacement Lamps

PLEASE NOTE: DLC DEFINES ALL TUBE-STYLE LED PRODUCTS TO FALL UNDER THIS
CATEGORY, EVEN IF SAFETY ORGANIZATIONS CLASSIFY THEM AS RETROFIT KITS DUE TO
THE NEED TO PERFORM ELECTRICAL OR MECHANICAL ALTERATIONS TO THE EXISTING
FIXTURE FOR PROPER INSTALLATION. ONLY FULLY-INTEGRATED “INSERT” STYLE KITS
WILL BE ELIGIBLE UNDER THE RETROFIT KIT CATEGORIES.

DLC will accept applications for Four-foot Linear Replacement Lamps. The testing and reporting
requirements described below are intended to evaluate the performance both of the lamp itself, and
its performance in a reference 2x4 troffer, the most common application for these products.

For testing purposes, DLC requires testing both of the bare lamp, and in one typical fixture housing.
These typical fixture housings are intended to provide testing results of the most common applications
these products are used in, as well as representative thermal conditions in the fixtures that the lamps
would be installed in. In specifying these particular fixture housings, DLC does not endorse or exclude
any particular make or model frame for use in energy efficiency programs.

Applicants shall test and report performance under the following restrictions and conditions.

Lamp Level Tests
All lamps seeking qualification of the DLC must test the bare lamp according to LM-79.

Individual Lamp Criteria
System Efficacy	≥ 100 LPW
Initial Light Output	≥ 1,600 lumens
Correlated Color Temperature (CCT)	≤5000K
Color Rendering Index (CRI)	≥ 80
Power Factor	≥ 0.90
Total Harmonic Distortion	≤ 20%
Warranty	≥ 5 Years

Testing Notes
For integrating sphere testing, use the manufacturer’s power supply or a standard 0.88 ballast factor Instant Start ballast (if the system uses the existing ballast).

Fixture Level Tests
All lamps seeking qualification must be tested with two lamps properly installed in a reference troffer.
The reference troffer may be any of the following, or a pre-approved equal:

Lithonia 2GT8 lensed 2X4
Lithonia 2PM3N 12 cell 2x4 parabolic
Cooper Metalux 2GC8 lensed 2x4
Cooper Metalux 2EP3 12 cell 2x4 parabolic
Columbia Lighting lensed 4PS24
Columbia Lighting P224 12 cell parabolic
Pre-approved Equal

Pre-approved Equals
DLC does not endorse or exclude any particular make or model of reference fixture. Options listed are
intended to illustrate common fixtures of the appropriate type. Manufacturers may test in alternative
fixtures to those listed, with pre-approval from the DLC. Pre-approved fixtures must meet the
following conditions:

Alternative fixtures must be commonly used in the application category intended to be applied for.
Documentation may be required to demonstrate fixtures appropriate use if questions arise.
Alternative fixtures must provide similar thermal environments to those listed. Particularly,
alternative fixtures may not be significantly different in internal volume or construction materials.

In-situ Lamp Criteria
Luminaire Efficacy (when two (2) lamps are installed in a Reference Troffer)	≥ 85 LPW
Minimum Initial Luminaire Light Output (when two (2) lamps are installed in a Reference Troffer)	3,000 lumens
Spacing Criteria	Spacing Criteria: 0-180˚ = 1.0-2.0 90-270˚ = 1.0- 2.0 Zonal Lumen Distribution: 0-60°: ≥75%
Lumen Maintenance L₇₀	50,000 hours

Lumen Maintenance

LM-80 for the package/module/ array (6,000 hours minimum)
In-situ Temperature Measurement Test (ISTMT) in selected Reference Troffer with two identical
lamps (only one is required to have thermocouple(s) attached).
TM-21 Calculator, appropriately filled out (www.energystar.gov/tm21calculator)

Installation Instructions
Installation instruction sheets must be submitted with the application to indicate how the replacement
lamp will be installed in an existing fixture in the field. Lamps that employ rotatable end-caps, or that
require specialized components in order for installation to perform to the above criteria, will not be
eligible for qualification. This must be provided in addition to all necessary documentation required for
other product categories.

Safety Certification Documentation
Documentation of safety certification for the replacement lamp must be submitted with the
application. This documentation must indicate safety certification has been obtained. DLC staff will
not interpret safety testing as proof that safety certification has been obtained. This must be provided
in addition to all necessary documentation required for other product categories.

Application Review
DLC shall log, analyze and evaluate four-foot linear replacement lamp applications in accordance with procedures followed for any individual fixture application: 1) for completeness and accuracy of the filed application data and 2) for qualification according to DLC category specifications.

To view the Four-foot Linear Replacement Lamp Policy under v1.7 Technical Requirements, click here.