Testing and Reporting Requirements for Direct Current (DC) and Power over Ethernet (PoE) Lamps, Luminaires, and Retrofit Kits
DC and PoE systems have the potential to reduce electrical losses from AC to DC conversions, integrate directly with DC generation sources such as solar and batteries, reduce installation costs, and connect more readily to IT infrastructure for advanced lighting control. These Requirements for DC and PoE Products enable high quality DC and PoE lighting products to be qualified and listed on the DLC SSL QPL.
Products powered by Direct Current (DC) and Power over Ethernet (PoE) must comply with the provisions of this document to be eligible for listing on the DLC Solid-State Lighting Qualified Products List (SSL QPL). DC/PoE products are defined as SSL lamps, luminaires, and retrofit kits that are powered by a DC voltage. PoE products are a specific subset of DC products that comply with the IEEE 802.3 Standards for carrying both power and communication signals on Ethernet cables. Qualified products will be listed as DC or PoE products on the DLC SSL QPL. If DC/PoE lamps, luminaires, and retrofit kits are also capable of being powered by Alternating Current (AC) voltage and the manufacturer desires to have them listed as suitable for both AC and DC, then the AC listing of the product must have a distinct model number that is different from the DC listed product, and it must be separately qualified.
The DLC lists DC/PoE lamps, luminaires, and retrofit kits on the SSL QPL based only on the luminous efficacy of these products as measured at their DC power input. The overall energy consumption of the DC/PoE systems also depends on DC line losses and DC power source efficiency, in addition to luminaire or lamp efficacy. However, given the variation in system architectures and power losses, the DLC does not publish system-level efficacies for DC/PoE SSL products. The DLC has developed a separate document to be provided to utility and energy efficiency program administrators that will provide basic guidance for accounting for system losses of DC/PoE SSL products.
The following are definitions associated with DC/PoE products:
- DC Power Source: In this policy, the term “DC Power Source” is used to indicate the device(s) that connect AC mains to the lines directly providing DC input power to the DC/PoE product. Though DC/PoE products may be used entirely disconnected from the AC power grid, the primary focus of this policy is grid-connected SSL lighting. A DC Power Source may be more typically known as any of the following:
- AC-to-DC Power Converter
- Power over Ethernet Power Sourcing Equipment (PoE PSE), also known as a PoE Switch
- AC/DC Multi-Directional Inverter
- DC-to-DC Driver: An LED driver that is typically integrated into the luminaire that converts the DC voltage received at the DC luminaire into the DC voltage required to operate the LEDs in the lamp, luminaire, or retrofit kit. Not all DC/PoE lamps, luminaires or retrofit kits require a DC-to-DC driver.
The following are eligibility rules for DC/PoE products:
- DC/PoE products are only eligible to be submitted as “Family Grouping” DLC application types and must be tested in accordance with the requirements of the family grouping policy. This applies to both single DC/PoE products and DC/PoE product families.
- DC/PoE products must meet all DLC Technical Requirements for the General Application(s) and Primary Use(s) they are submitted for, including minimum lumen output, efficacy, correlated color temperature (CCT), color rendering index (CRI), lumen maintenance, and zonal distribution/spacing, with the exception of total harmonic distortion (THD) and power factor.
- Products marketed or intended for use disconnected from the AC power grid are eligible for listing on the SSL QPL. However, if applicable, eligibility of these products for efficiency program incentives/rebates is at the discretion of efficiency program administrators and should not be assumed based only on QPL listing.
- Linear replacement lamps, mogul screw-base replacement lamps, and 2G11-based replacement lamps for CFLs are only eligible for listing as DC/PoE products if they are UL Type C products. A Type C DC/PoE replacement lamp must utilize DC voltage as the input to the remote driver; replacement lamps utilizing DC voltage only between driver and lamp are eligible as AC products, not DC/PoE products.
- DC/PoE luminaires will only be classified as DLC Premium if they meet all DLC Premium classification requirements. An LED Driver ISTMT is required for DLC Premium submissions of luminaires with an integrated DC-to-DC driver. Additional documentation is required for the driver per the requirements for Premium luminaires.
- DC/PoE products may also have other eligible adjustable product features for AC products, such as Color-Tuning and Dimming, in which case they are also subject to the relevant DLC Testing and Reporting Requirements for those types of products. If products exhibit multiple performance features, they must comply with all applicable Testing and Reporting Requirements.
Testing Methods and Requirements
Testing for DC/PoE products must be provided to cover all areas of investigation as is required for AC family groups. Per the eligibility criteria above, all DC/PoE products must be submitted as a Family Group, regardless of the number of products submitted. The below requirements apply to the DC/PoE luminaire, lamp, or retrofit kit under consideration, as test reports will not be required on the DC Power Source.
- The DC/PoE product or group of products shall be tested according to the guidelines for electrical instrumentation of DC devices in the Illuminating Engineering Society’s (IES) LM-79 publication.
- The intent of the LM-79 test reports required for DLC submission is measurement of the luminaire efficacy as well as other photometric characteristics under DC power without including DC Power Source conversion losses or line losses.
- Many DC/PoE products, for example PoE, utilize cables with multiple conductors. LM-79 test reports shall be based on the sum of all power delivered to the product across all connected conductors. The test report shall document the number of powered conductors, and pair-wise grouping if applicable.
- Voltage and current measurements shall be made at the point of entry to the luminaire or retrofit kit, or at the input terminals to the driver in the case of UL Type C replacement lamps. For luminaires and retrofit kits, these measurements shall include any DC-to-DC driver circuitry that is included and shipped under the same model number as the luminaire or retrofit kit, but exclude drivers that need to be ordered separately under a different model number. For UL Type C replacement lamps, these measurements shall include the remote DC-to-DC driver circuitry. If the test laboratory is in doubt about the proper interconnection or placement of voltage sensing leads for power measurement, they should consult the manufacturer.
- Test laboratories should connect measurement equipment in such a manner that creates minimal disruptions to data communication if the DC power connection carries both data and power. Manufacturers should, if necessary, provide testing labs with instructions for achieving a state of full light output without the consumption of unnecessary communication power.
- Any removable accessories not required to achieve full light output, such as removable photosensors or occupancy sensors, shall be removed during LM-79 testing. Any accessories with controllable power states that are not required to achieve full light output, such as cameras, microphones or external luminaire power connections, shall be disabled/powered down during LM-79 testing.
- The luminous efficacy according to the LM-79 test method shall be provided at two voltages:
- The DC input voltage that results in the worst-case luminous efficacy. The tested voltage must result in the worst luminous efficacy across the product’s operating range of input voltage. The product’s voltage range is determined based on the information in the manufacturer’s specification sheets and, if applicable, within the input voltage range of the established system protocol (e.g. between 42.5V and 57V for IEEE 802.3at Type 2 PoE powered devices). For any application where the worst-case submitted voltage is not the lowest voltage in the operating range, the manufacturer must submit a written justification explaining why their product performs at lower luminous efficacy at the higher input voltage. This justification must be in a formal document submitted through the DLC Application Portal. Verbal explanations, emailed explanations, or explanations written into the Portal messaging system will be requested to be formally written and submitted.
- A nominal DC voltage chosen by the manufacturer. The nominal DC voltage chosen must be within the product’s operating range of input voltage according to the manufacturer’s specification sheets or system documentation, and, if applicable, within the input voltage range of the established system protocol (e.g. between 42.5V and 57V for IEEE 802.3at Type 2 PoE powered devices) and less than any maximum voltage permitted under the National Electrical Code for the wiring and power specified (e.g. NEC maximum of 60V for Class 2 above 5 mA). The nominal voltage shall be different from the worst-case voltage from section (a) above.
- Manufacturers must provide instructions to the testing laboratory for how to achieve the full light output state for LM-79 testing. Full light output state is defined as the light output state where the product is delivering its maximum lumen output, with any dimming input control signal set to the maximum setting.
- In-Situ Temperature Measurement Tests (ISTMTs) must be conducted as defined by the appropriate safety standard, per applicable safety certifications. TM-21 projections will use this thermal measurement in conjunction with the provided LM-80 data and rated drive current to evaluate lumen maintenance and compliance with L70 requirements. Alternatively, LM-84 testing and TM-28 projections will be acceptable. Please contact email@example.com if you intend to use this alternative LM-84 approach.
Applicants shall provide the following supporting documentation for DC/PoE products. If any of the following information is not clearly documented in the installation guide, product specification sheet, or other supporting technical or marketing materials, the application will be considered incomplete and the DLC reviewer will not proceed in reviewing the application until the necessary information is provided.
- Product Installation, Power Source, and Wiring documentation covering the following:
- Nominal input voltage to luminaire, lamp or retrofit kit, when applicable
- Range of acceptable input voltages to luminaire, lamp, or retrofit kit
- List of compatible DC Power Source models and/or parameters for choosing compatible DC Power Sources
- List of compatible cable models, and/or parameters for choosing wiring gauge and type
- Where applicable, reference to standard compliance and relevant product subcategories/classifications
- For PoE products, reference to IEEE 802.3af/at/bt standard compliance, PoE type, and device class
- Safety Certification
- The requirements for safety certification of DC/PoE products are the same as the safety provisions listed for AC products.
Listing on the QPL
The DLC intends to list DC/PoE lamps, luminaires, and retrofit kits on the SSL QPL based only on the luminous efficacy of these products as measured at their DC power input. DC/PoE products are listed on the SSL QPL according to their worst-case efficacy as documented in the LM-79 report(s) specified in Section 2a of the Testing Requirements above. All existing QPL fields apply to DC/PoE products except for total harmonic distortion (THD) and power factor (PF). These two fields are either left blank or “N/A”. DC/PoE products are distinguished from AC products on the SSL QPL as follows:
- DC/PoE listings on the QPL will prominently feature and point to a supplemental guide or pop-up window that provides important information for how to use the DC/PoE listing data, which is different from non-DC/PoE listing data.
- Five new fields have been created for DC/PoE listings, two of which are exclusively applicable to PoE, and one existing field has been modified:
- “System Type”. This new field applies to all products on the QPL and is populated with text as “AC”, “DC”, or “PoE”.
- “Test Voltage”. This new field is required for DC and PoE products and may also be applied to existing AC products. It is a numerical value that lists the voltage from the LM-79 test report (e.g. 24 Volts, 380 Volts, etc.) that corresponds to the worst-case luminous efficacy listed for that product.
- “Voltage Range”. This new field applies to both AC and DC products, and lists the range of acceptable input voltage for the product (e.g. 120-277VAC, 44-57VDC).
- “DC Efficacy”. This new field lists the worst-case efficacy of DC/PoE products, which is different from the current “Efficacy” field for existing products. The existing “Efficacy” field on DLC QPL has been changed to “AC Efficacy” to clearly differentiate from the “DC Efficacy” of DC/PoE products.
- “PoE Type/Class”. This new field is only applicable to PoE products and lists the Type and Class of PoE utilized.
- “PoE Connection”. This new field is exclusively for PoE products to indicate whether the product connects directly or indirectly to the PoE network; for example, whether a luminaire connects directly to the PoE network, or indirectly through another luminaire or driver that is connected to the PoE network.