Technical Requirements V5.1

V5.1 Policy Clarifications and Updates

As the DLC processes applications for V5.1, we have encountered the need for minor corrections, clarifications, and policy changes. In order to be as transparent as possible, the V5.1 Policy documentTechnical Requirements Tables (TRT), and Manufacturer and Industry Guidance will be updated as needed, and the changes will be tracked in the relevant documents and in the table below, which shows the corrections or clarifications and where they can be found in the document(s).

Date UpdatedChange TypeDescriptionAffected Document
5/13/2024Clarifications, Policy ChangeLUNA clarifications, TM21 requirements, DLC Glossary language

Addition of references to the LUNA program. Addition of language to allow use of the IES TM-21 calculator for submissions. Minor language adjustments to align with the DLC glossary, corrected an incorrectly ordered instance in the change log.
V5.1 Policy – 11, 13, 24, 25, 27, 37, 38, 42, 45
11/30/2022Correction Approved Housings
The link to the approved housings page was incorrect. Correct link was swapped in.
V5.1 Policy – 35
10/19/2022Policy ChangeLM-79 Distribution

Describes a method by which the uplight and
downlight components of indoor luminaires
may be measured separately in a
goniophotometer and combined into a single
LM-79 report.
V5.1 Policy – 37, 38
4/15/2022Policy ChangeIntegral Control Sensor Options
Adds “Ambient Light” as an acceptable term for daylight sensors.
V5.1 Policy – 23
2/23/2022Policy ChangeSpecial
Considerations for
Dimmable Lamps

Adds a requirement for Type A T8 8’ lamps claiming to be dimmable via a wired protocol. Due to a lack of dimmable ballasts for T8 8’ lamps, The DLC will not accept T8 8’ lamps that claim wired dimming
capability via direct input from the ballast.
V5.1 Policy – 20, 21
2/8/2022Policy ChangeSpecial Considerations for Dimmable Lamps
Shortens the name of the communication protocol classification for Type B dimmable lamps using an external device to receive a wired control signal
V5.1 Policy – Page 21

Clarification Integral Control

Generalizes the Multifunction Sensor category to
include functions other than Occupancy + Daylight
V5.1 Policy – Page 19
10/18/2021Policy ChangeWarranty

Adds an exception to warranty requirements for consumable components of products
V5.1 TRT – Page 23
10/15/2021ClarificationColor Maintenance

Adds description of the appropriate drive current
to be used for the LM-80 data set
V5.1 Policy – Page 10
9/20/2021ClarificationColor Rendering Notation
Changes the notation of Ra to include (CRI) for clarity
V5.1 Policy – Pages 7, 8, 28, 29, 32
9/20/2021ClarificationBeam Angle Tolerance
Clarifies the PUDs applicable to the beam angle tolerance requirement
V5.1 Policy – Pages 14, 32
9/20/2021ClarificationDocument Format
Clarifies that the formatting of this document does not correlate to the SSL V5.1 Technical Requirements
V5.1 TRT – Page 1
9/20/2021ClarificationDriver / Power Supply Requirement
Adds an example documentation to help identify specific types of power supplies
V5.1 TRT – Page 14
9/20/2021ClarificationColor Rendering Notation
Changes the notation of Ra to include (CRI) for clarity
V5.1 TRT – Page 17, 19, 20
6/23/2021Policy ChangeAlternative testing procedures
Expands alternative testing procedures to include any PUD with independent uplight and downlight
V5.1 TRT – Page 28
6/23/2021ClarificationMultifunction integral controls
Broadens the types of controls that can be categorized as multifunction
V5.1 Policy – Page 22
6/23/2021ClarificationPhase cut control communication

Revises Power Line/Phase-Cut communication types to only include products that specifically use phase-cut. Products communicating via Power Line are listed as “Wired Other.”
V5.1 Policy – Page 24
5/5/2021ClarificationFiltering for BUG on the QPL
More information on how to find BUG Ratings on the QPL
V5.1 Policy – Page 14
5/5/2021ClarificationAcceptable terms for dimming
To meeting dimmability requirements Specification sheets do not explicitly need to state “dim”, “dimmable”, or “dimming”; using terms from Table 9 is acceptable
V5.1 Policy – Page 18
5/5/2021ClarificationExamples of calculating UGR
Clarified how to calculate UGR for basket type troffers
V5.1 Policy – Page 38
5/5/2021ClarificationSpecial Considerations for Dimmable Lamps
Clarifies how UL Type B lamps using an external device to dim will be complete application form
V5.1 Policy – Page 20
5/5/2021ClarificationColor Rendition Tolerances
More clearly lists out tolerances to color rendition
V5.1 Policy, TRT – Page 31 (Policy); Page 20 (TRT)
3/25/2021Policy ChangeTesting Constraints
Broadening alternative testing procedure for luminaires that do not fit inside typical photometric testing equipment from products within the linear ambient primary use designation only to any linear style product.
V5.1 TRT – Page 28
3/10/2021Policy ChangeSpecial Considerations for Dimmable Lamps
Because lamps are most often used in retrofit applications, there are special considerations needed to ensure end users can dim lamps as desired. The policy change requires more of Type B lamps that claim to be dimmable with wired protocols.
V5.1 Policy – Pages 20, 21
1/22/2021ClarificationLinking SPDX information to LM-19
In order to link TM-27 and LM-79 documents, the following language has been added: “The product model number shall be present and match in both the TM-27 and LM-79 documents”
V5.1 Policy –
Page 35
1/22/2021CorrectionIES Rcs,h1 tolerance
IES Rcs,h1 tolerance corrected from “-1%” to “+/- 1%”

V5.1 Policy and TRT –
Page 32 (Policy)
Page 20 (TRT)
1/22/2021CorrectionProducts required to meet Beam Angle
2G11 base replacement lamps must also meet Beam Angle requirements, along with linear replacement lamps
V5.1 Policy and TRT –
Pages 13, 15, 16, 32 (Policy)
Page 21 (TRT)
11/13/2020ClarificationProducts with UGR < 10
Original version did not indicate what bin to use when a product has UGR values lower than the listed range: if a product has a UGR less than 10.0, it will fall in the 10.0-12.9 bin.
V5.1 Policy and TRT – Page 13 

11/13/2020CorrectionDriver operating temperature
Original versions of the V5.1 Technical Requirements Tables made reference to “driver operating temperature,” which should have read “driver operating temperature specification for which the driver is designed to last ≥50,000 hours”
V5.1 Policy and TRT – Page 13, 14
11/13/2020ClarificationLarge Linear Ambient Testing
The DLC has developed and approved alternative procedures for testing linear ambient products with a length greater than or equal to five feet and linear ambient products with indirect components.
V5.1 TRT – Page 28
10/15/2020Policy ChangeISTMT Testing on Linear Replacement Lamps
Linear replacement lamps can now conduct in-situ temperature measurement testing (ISTMT) via one of the two methods: either on the bare lamp per safety certifications, or in a selected reference luminaire.
Testing and Reporting Requirements for
Linear Replacement Lamps – Page 8, 10
10/15/2020ClarificationAcceptable Integral Control Terms
Broadens acceptable terms on the Product Spec Sheet or Supplemental Literature
V5.1 Policy – Page 21
10/15/2020ClarificationDefinition of Multi-function integral controls
Multifunction integral controls are an interior control capability.
V5.1 Policy – Page 21
10/15/2020ClarificationColor testing if minimum color rendition was not captured
The DLC requires that color testing be conducted on the worst-case CCT, CRI, and efficacy variations, which is likely the combination of lowest CCT and highest color rendition. If the overall minimum color rendition option was not captured in any LM-79/color report above, this configuration must be tested.
V5.1 Policy – Page 9
10/15/2020ClarificationEfficacy allowances for FALD products
While FALD products are not eligible for efficacy allowances related to discomfort glare, they are eligible for other allowances
V5.1 Policy – Page 9
9/1/2020Testing changeElectrical testing in full LM-79/distribution reports
Some goniophotometers do not have the ability to measure/report total harmonic distortion (THD). As such, THD as well as Power Factor will not be tested as part of the full LM-79/distribution reports.
V5.1 Policy and Manufacturer and Industry Guidance – Page 31
8/20/2020Policy ChangeOutdoor RRequirement
The R9 requirement for outdoor products has been changed from a required threshold to a reporting requirement only. High-bay products must still meet R9 ≥ -40.
V5.1 Policy and TRT – Page 8
7/30/2020Guidance addedColor Maintenance reporting requirements
LM-80 reports may not include absolute Duv information for each reporting interval, but only the change in Duv from 0 hours. Guidance has been added to  the policy document and Manufacturer Guidance that describes how to report maintenance in the case that average chromaticity coordinate data at the ≈ 1000-hour and ≈ 6000-hour measurement points are not provided and only chromaticity shift (Δu’v’) data is available.
V5.1 Policy and Manufacturer and Industry Guidance – Page 10
6/17/2020ClarificationWhite-tunable testing requirements
Clarified requirements around testing and reporting at various CCT settings for all white-tunable products; not just DLC Premium.
V5.1 Policy – Page 11
6/17/2020ClarificationRange of continuous dimming capability
Original versions of the V5 policy documents were not clear about designating the range of continuous dimming capability, in which the options were “Above 10%, Below 10%.” This version of the document clarifies the options as “Above 10%, Less than or equal to 10%.
V5.1 Policy and TRT – Page 17
6/17/2020ClarificationExpanded rationale regarding dimming requirements
The V5.0/V5.1 dimming policy enhances controllability and ensures that products listed on the QPL have the capability to be dimmed and are marketed as such. The DLC does not set requirements regarding how qualified dimmable products are installed and/or used in the field.
V5.1 Policy – Page 18
6/17/2020CorrectionDriver warranty temperature
Original versions of the V5 policy documents made reference to “driver operating temperature,” which should have read “driver warranty temperature.”
V5.1 Policy and TRT – Page 24
6/17/2020Clarification“Bare lamp” terminology
Language has been added to clarify that the term “bare lamp” represents the performance of replacement lamps when operated outside of a luminaire or retrofit kit, including a ballast for Type A or driver for Type C. The Linear Replacement Lamps policy has also been updated to reflect this change.
V5.1 Policy – Page 39
6/17/2020ClarificationFull LM-79/color report and full LM-79/distribution report instructions
Clarifications have been added around submitting photometric test reports to comply with the full LM-79/color report or full LM-79/distribution report definitions.
V5.1 Policy – Page 34
6/17/2020CorrectionScaled vs. reported tab terminology
The SSL application form has a tab called the “Reported Performance Table.” The original version of the V5.1 policy document referenced the “Scaled Performance Table.” The correct terminology is “Reported Performance Table.”
V5.1 Policy – Page Through-out
6/17/2020CorrectionLumen Maintenance – L70 not required for DLC Premium
Original version incorrectly stated that the L90 requirement for DLC Premium “is in addition to the L70 requirements of the DLC standard classification.” There is no L70 requirement for DLC Premium; just L90 ≥ 36,000 hours.
TRT – Page 13
6/17/2020ClarificationExclusions from DLC Premium
More clearly states that Linear-Style Retrofit Kits for Troffers are not eligible to qualify for the DLC Premium classification under V5.1.
TRT – Page 12