Introduction
LED lighting has transformed the global lighting market with its energy efficiency, longevity, and environmental benefits. However, the rapid expansion of LED products has raised concerns about electromagnetic compatibility (EMC). Poor EMC performance can disrupt other electronic devices, increase energy waste, and pose potential health risks.
A comprehensive study conducted by Wang Qingmin et al. (2024) analyzed the electromagnetic disturbance (EMD) levels of LED lighting products in the Jining market from 2021 to 2023. This article summarizes their findings, supported by data, and offers actionable insights for manufacturers, exporters, and quality assurance professionals.
Study Overview
The study involved random sampling of LED bulbs and LED desk lamps from retail markets and supermarkets across Jining, China. Over three years, 60 samples were tested against Chinese national standards:
GB/T 17743-2021 (Radio Disturbance Characteristics)
GB 17625.1-2012 (Harmonic Current Emission)
GB 17625.1-2022 (Updated Harmonic Current Limits)
Tests covered:
Disturbance Voltage
Radiated Electromagnetic Disturbance (9 kHz – 1 GHz)
Harmonic Current Emission
Key Findings with Data Support
1. Overall EMD Performance: LED Desk Lamps Outperform Bulbs
The study found that while LED desk lamps consistently complied with disturbance voltage standards, LED bulbs showed significant non-compliance.
|
Year |
Product |
Samples Tested |
Passed EMD Tests |
Pass Rate |
|---|---|---|---|---|
|
2021 |
LED Desk Lamp |
10 |
10 |
100% |
|
2022 |
LED Desk Lamp |
6 |
6 |
100% |
|
2022 |
LED Bulb |
19 |
7 |
36.8% |
|
2023 |
LED Desk Lamp |
9 |
9 |
100% |
|
2023 |
LED Bulb |
10 |
4 |
40.0% |
LED desk lamps achieved a 100% pass rate across all three years.
LED bulbs consistently underperformed, with pass rates below 40%.
2. Harmonic Current Emission: A Universal Challenge
Using the updated GB 17625.1-2022 standard as a benchmark, the study found that all sampled products failed to meet harmonic current limits.
|
Year |
Product |
Samples Tested |
Compliant with GB 17625.1-2022 |
Pass Rate |
|---|---|---|---|---|
|
2021 |
LED Desk Lamp |
10 |
0 |
0% |
|
2022 |
LED Desk Lamp |
6 |
0 |
0% |
|
2022 |
LED Bulb |
19 |
0 |
0% |
|
2023 |
LED Desk Lamp |
9 |
0 |
0% |
|
2023 |
LED Bulb |
16 |
0 |
0% |
Total Harmonic Distortion (THD) frequently exceeded 70%, with some samples doubling the limit.
The 3rd and 5th harmonic currents were the most common offenders.
3. Root Causes: Design Determines Performance
The study identified key reasons for the performance gap:
LED Desk Lamps: Typically include dedicated power adapters with built-in EMC filtering.
LED Bulbs: Often use simplified driver circuits without adequate EMC suppression.
This highlights the importance of incorporating EMC design early in the product development phase.
Implications for Manufacturers and Exporters
1. Compliance with Updated Standards
The GB 17625.1-2022 standard now explicitly includes limits for low-power LEDs (5W–25W), closing a previous regulatory gap. Manufacturers must:
Test products against the new harmonic current limits
Redesign drivers and filters to meet THD requirements
2. Market Access and Reputation
Products that fail EMC tests may face:
Rejection by regulators
Returns from buyers
Damage to brand reputation
Ensuring compliance is essential for maintaining international market access.
3. Technical Recommendations
Incorporate EMC filters and shielded drivers
Use power factor correction (PFC) circuits
Conduct pre-shipment EMC testing
Partner with accredited laboratories for certification
Conclusion
The research by Wang Qingmin et al. (2024) clearly shows that while the overall EMD level of LED lighting in the Jining market is reasonably good, significant challenges remain-especially with LED bulbs and harmonic current emissions.
For manufacturers and exporters, proactive EMC design and rigorous testing are not optional-they are critical to product quality, regulatory compliance, and international competitiveness.
Reference:
Wang Qingmin, Zhang Jing, Wang Dong, Shen Yuman, Kong Qiangqiang. Analysis on the Electromagnetic Disturbance Sampling Results of LED Lighting Products in the Circulation Field of Jining Market from 2021 to 2023. Light & Lighting, 2024, 48(2): 62–65.
Word Count: 598
Note: This article is based on the original research and has been adapted for industry knowledge sharing. All data and conclusions are credited to the authors mentioned above.
FAQ
Any question or wanna send an inquiry!
Q1. How soon is the lead time?
A: For sample order, 7-17 days if no stock. For bulk order, 15-30 days.
Q2. Can your products' label, packaging, design be customized?
A: Yes, we offer customization service on these.
Q3. How can we guarantee quality?
A: Always a pre-production sample before mass production; Always final Inspection before shipment.
Q4. How do you ship the goods and how long does it take to arrive?
A: We usually ship by DHL, UPS, FedEx or TNT. It usually takes 3-5 days to arrive. Airline and sea shipping also optional.
Q5. What is your payment way?
A: Paypal / Visa / Western Union / online transfer / apply pay / T/T all works for us for payment.
https://www.benweilight.com/lighting-tube-bulb/grow-lights-for-seedlings.html
Shenzhen Benwei Lighting Technology Co.,Ltd
Telephone: +86 0755 27186329
Mobile(+86)18673599565
Whatsapp ：19113306783
Email:bwzm15@benweilighting.com
Skype： benweilight88
Web: www.benweilight.com
