After more than a decade in the LED street light export business, luminous efficacy is one of the parameters customers ask about most frequently. Many buyers simply compare quotations by "how many lumens per watt," assuming that a higher number is always better. In reality, efficacy must be evaluated together with system performance, actual operating conditions, and long-term stability; chasing high numbers alone easily leads to problems. To judge what luminous efficacy level for LED street lights counts as good, it is necessary to discuss chip efficacy, system efficacy, and real project requirements separately-only then is the logic rigorous. Drawing on our daily testing and overseas project experience, I will clarify the key points.
First: Distinguish Chip Efficacy from System Efficacy
Many promotional materials quoting "200 lm/W" refer to laboratory data for the LED chips themselves, not the system efficacy of the complete luminaire. System efficacy is the effective value the customer actually receives; it already deducts driver losses, optical losses from lenses or reflectors, and thermal derating. At present, reliable LED street lights commonly achieve system efficacy in the 140–160 lm/W range, while some high-efficacy models can stably reach 170–180 lm/W. Figures beyond this range must still be examined for test conditions and sustainability. During incoming inspection, we require full-luminaire LM-79 reports rather than chip specification sheets alone. Long-tail terms such as "LED street light system efficacy" and "high-efficacy LED street light actual testing" carry more weight in professional procurement than pure chip numbers.
Current Reasonable Industry Levels and Common Project Requirements
Based on market conditions in 2024–2025, municipal road and highway project tenders generally regard system efficacy of 150 lm/W or higher as a good level that can noticeably reduce the number of fixtures installed and later electricity costs. For ordinary industrial parks or rural roads, around 140 lm/W can already meet needs. Excessively high efficacy often comes with higher chip costs and stricter thermal design requirements; if driver efficiency and optical matching cannot keep up, light output will drop faster in actual use. We have encountered customers who specified above 180 lm/W, only to find that sample lights suffered rapid efficacy decline in high-temperature environments. Therefore the standard of "good" is not an absolute number, but the ability to deliver stable output at the target power, pass third-party testing, and match local illuminance requirements.
Key Factors Affecting Efficacy Cannot Be Ignored
Efficacy is jointly influenced by LED chip quality, driver conversion efficiency, secondary optical design, and overall thermal management of the luminaire. Driver efficiency below 90 % directly drags down system efficacy; poor lens transmittance or unreasonable light distribution also reduces effective utilization. Inadequate heat dissipation raises junction temperature, damaging both efficacy and lifespan at the same time. In our factory testing, we measure under both rated power and elevated temperature conditions to confirm the authenticity of efficacy data. When selecting, do not look only at initial efficacy; also pay attention to lumen maintenance-the percentage retained after several thousand hours of operation.
Balance Between Efficacy and Other Performance Aspects Matters More
Blindly pursuing high efficacy may sacrifice color rendering index, glare control, or anti-glare design. Some high-efficacy luminaires stack lumens in a way that produces overly narrow or excessively bright distributions, resulting in poor road uniformity and driver discomfort. A good LED street light should strike a balance among efficacy, light distribution, color temperature, and reliability. Certain projects in Europe and the Middle East already evaluate system efficacy together with glare rating (G class) and energy labels; a single high number is no longer the sole scoring advantage. We advise customers to calculate the total lumens required according to road class, pole height, and spacing first, then work backward to a reasonable efficacy and power-this approach is more scientific.
Actual Verification Is More Reliable Than Promotional Figures
Ultimately, whether efficacy meets the standard depends on third-party reports and on-site sampling. Report numbers should be verifiable on the laboratory's official website, and test conditions must state ambient temperature and input voltage. Every export batch we ship retains complete photometric data for customers to cross-check during acceptance. If a manufacturer provides only promotional brochures and refuses to supply verifiable LM-79 documents, the data can basically be judged to contain significant inflation.
Efficacy is an important indicator, but not the only one. Achieving system efficacy above 150 lm/W with genuine, verifiable data that remains stable in real environments is what truly qualifies as "good." Blindly chasing higher numbers often costs more than it gains.
Conclusion
What luminous efficacy level for LED street lights counts as good hinges on genuine and reliable system efficacy that matches project needs, thermal design, and optical performance. The current good range mostly lies between 150–180 lm/W, but it must be supported by complete test reports. Luxsky Lighting's LED street lights maintain system efficacy at the forefront of the industry, using high-efficiency chips together with optimized optics and driver solutions. All products come with verifiable third-party reports such as LM-79 and demonstrate low lumen depreciation in actual projects. Many overseas customers choose to work with us precisely because of the real efficacy and long-term stability.
If you are comparing efficacy parameters or need selection advice for specific roads, please contact us directly. Send us the pole height, road width, and illuminance requirements, and we will provide a practical solution. Choosing high-efficacy and reliable LED street lights starts with seeing the real data clearly-and it starts with choosing Luxsky Lighting.
