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Against the background of global energy conservation and emission reduction policies, North America has imposed increasingly stringent energy efficiency requirements on road lighting products. The solid-state lighting certification system launched by the DesignLights Consortium (DLC) has become an essential threshold for LED street lights to be included in North American utility procurement lists. This article sorts out core standards, technical specifications and application procedures of DLC certification for industry reference.
1. Overview of DLC Certification System
Founded led by the Northeast Energy Efficiency Partnership (NEEP), DesignLights Consortium is a non-profit organization committed to popularizing high-quality solid-state lighting products across North America.
DLC certification is not legally mandatory, yet it serves as a prerequisite for applying for utility subsidy programs in most U.S. states. LED street lights without DLC listing are generally excluded from government road lighting renovation project procurement catalogs.
2. Core Standards & Testing Basis
2.1 IES LM-79-19 Electrical and Photometric Measurements
Issued by the Illuminating Engineering Society of North America (IES), this standard specifies measurement methods for electrical and photometric parameters of solid-state lighting products, acting as the fundamental technical basis for all DLC tests.
表格
| Item | Details |
|---|---|
| Standard No. | IES LM-79-19 |
| Latest Version | 2019 Edition (continuously updated) |
| Test Contents | Total luminous flux, luminous efficacy, correlated color temperature, color rendering index, chromaticity coordinates, power factor |
| Application Scope | LED street lights, flood lights, high bay lights and other outdoor lighting fixtures |
2.2 IES LM-80-20 LED Lumen Maintenance Measurement
LM-80 defines test methods for lumen retention performance of LED light sources under specified temperatures, providing core data for predicting long-term service life of LED products.
表格
| Item | Details |
|---|---|
| Standard No. | IES LM-80-20 |
| Minimum Test Duration | 6000 hours (10000 hours is commonly required) |
| Test Temperatures | 55°C, 85°C and customized temperature points for simultaneous testing |
| Output Data | L70, L50 lifespan prediction results |
2.3 IES TM-21-19 Long-Term Lumen Depreciation Projection
Based on actual LM-80 test data, TM-21 specifies standardized lifespan extrapolation methods. Relevant technical reports are mandatory documents for DLC certification submission.
3. Detailed Technical Requirements of DLC V5.1
DLC V5.1 is the currently valid official specification with clear parameter thresholds for different grades of street lights.
表格
| Technical Parameter | Standard Version Requirement | Premium Version Requirement | Remarks |
|---|---|---|---|
| Minimum Luminous Efficacy | ≥90 lm/W | ≥120 lm/W | System efficacy including drivers |
| Color Rendering Index | ≥80 | ≥90 | Higher requirement for Premium grade |
| CCT Range | 2200K-6500K | 2700K-5000K | Wider range for standard version |
| Power Factor | ≥0.9 | ≥0.9 | Unified requirement for both grades |
| Lifespan Standard | L70 ≥50,000h | L70 ≥50,000h | Calculated per TM-21 method |
4. DLC Certification Application Process & Lead Time
Four main phases: document preparation → online submission → technical review → official listing
- Preparation: Confirm product specifications, complete LM-79 photometric test, finish over 6000-hour LM-80 test for LED modules and issue TM-21 lifespan report
- Online Application: Submit forms, test reports, product datasheets and IES files via official DLC website
- Technical Audit: DLC professional team reviews all submitted documents within 2–4 weeks; supplementary materials may be required
- QPL Listing: Approved products will be published on the official DLC Qualified Products List
表格
| Process Stage | Estimated Cycle |
|---|---|
| LM-79 Photometric Test | 5–10 working days |
| LM-80 Lumen Maintenance Test | 6000–10000 hours (conducted by third-party labs) |
| TM-21 Lifespan Calculation | 3–5 working days based on LM-80 data |
| DLC Official Technical Review | 2–4 weeks |
| Overall Cycle (with ready LM-80 data) | About 6–8 weeks |
5. FAQ
Q1: Is DLC certification compulsory for LED street lights exported to North America?A1: DLC is not government-mandatory certification. However, most North American utility companies regard DLC listing as a necessary qualification for renovation subsidies. It is advised to confirm local subsidy policies in advance to arrange certification properly.
Q2: What is the difference between DLC certification and UL certification?A2: UL is product safety certification issued by NRTL recognized labs authorized by U.S. Department of Labor. DLC belongs to energy efficiency certification reviewed by DLC alliance. They cover different compliance dimensions, and both are generally required for North America market access.
Q3: Can existing LED module LM-80 reports be directly used for DLC application?A3: Yes. Valid LM-80 test data can be reused for multiple finished lamp models, provided that the adopted LED module model is fully consistent. Complete model matching documents shall be submitted during application.
Q4: How difficult is it to apply for DLC Premium grade compared with standard grade?A4: Premium version sets higher thresholds on luminous efficacy (≥120 lm/W) and color rendering index. Manufacturers shall select suitable certification grade according to actual optical design capability instead of blindly pursuing Premium level.
Q5: What is the regular total lead time for DLC certification?A5: If complete LM-80 test reports are available, the whole process takes 6–8 weeks in general. If LM-80 long-term aging test needs to be arranged simultaneously, the total period may extend to over 6 months.
6. Conclusion
DLC certification is a vital access ticket for LED street lights to enter North American utility procurement markets, covering photometric testing, energy efficiency evaluation and lifespan verification. Before launching certification projects, manufacturers are recommended to communicate fully with CNAS/CMA accredited third-party laboratories to verify product compliance with DLC technical rules and rationally arrange the whole testing schedule.
This content is AI-assisted, for reference only, not regarded as official certification commitment or legal suggestion.
