Four-foot Linear Replacement Lamps

DLC will accept QPL applications for 4-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 reference 2x4 troffers, their most common application.

For testing purposes, DLC requires testing both of the bare lamp, and in two typical fixture housings. 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.

Table 5: Individual T-8 Replacement Lamp Criteria

Individual Lamp Criteria
System Efficacy	≥ 96 LPW
Initial Light Output	≥ 2200 lumens
Correlated Color Temperature (CCT)	2700K, 3000K, 3500K, 4000K, 4500K or 5000K
Color Rendering Index (CRI)	≥ 80, R₉ > 0
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 inside two reference troffers.

Reference Troffer #1:

Tested according to LM-79 with 2 lamps installed in a Lithonia 2GT8-2-32-A19-277-GEB10IS Prismatic Troffer. Note the A12 lens is also acceptable. Voltage variations (e.g. MVOLT) are also acceptable.

Reference Troffer #2:

Tested according to LM-79 with 2 lamps installed in a Lithonia 2PM2-G-B-2-32-12LD-277-GEB10IS Parabolic Troffer. Other trim variations (e.g. F or ST) or voltage variations (e.g. MVOLT) are also acceptable.

Table 6: In-situ T-8 Replacement Testing Requirements

In-situ Lamp Criteria
Luminaire Efficacy (when two (2) lamps are installed in Reference Troffers #1 and #2)	≥ 75 LPW
Minimum Initial Luminaire Light Output (when two (2) lamps are installed in Reference Troffer #1 and #2)	3750 lumens
Spacing Criteria	Reference Troffer #1: @ 0˚ = 1.24 ± 0.1 @ 90˚ = 1.5 ± 0.1 Reference Troffer #2: @ 0˚ = 1.25 ± 0.1 @ 90˚ = 1.63 ± 0.1
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 Reference Luminaire #1 with two identical lamps (only one is required to have thermocouple(s) attached).

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.