Heshan City advances classroom lighting renovation in accordance with national standards

2025-12-22 · Technical Q&A

——Heshan No.1 Middle School's eye-friendly lighting upgrade has achieved notable results [Education Work Updates] To implement the requirements for student myopia prevention and control and continuously improve classroom lighting conditions in primary and secondary schools, recently, under the coordinated promotion of the Heshan City education department

Quick Answer

Heshan No.1 Middle School completed a classroom eye-friendly lighting retrofit in accordance with the GB 7793 standard. After the retrofit, the average illuminance on desk surfaces reached 380–420 lx, and the average illuminance on writing boards reached 650–720 lx. The illuminance uniformity on desk surfaces was 0.75–0.80, and the illuminance uniformity on writing boards was 0.82–0.85. All indicators meet and comply with national standard requirements.

——Heshan No.1 Middle School's eye-friendly lighting upgrade has achieved notable results

[Education Work Updates] To implement the requirements for myopia prevention and control among students and continuously improve classroom lighting conditions in primary and secondary schools, recently, under the coordinated promotion of the Heshan City education department,Heshan No.1 Middle School successfully completed the classroom eye-friendly lighting renovation work. The renovation work strictly followed the Hygienic Standard for Day Lighting and Artificial Lighting for Middle and Elementary School (GB 7793), systematically upgraded the classroom lighting environment, and achieved notable results.

[Figure 1: Installation effect of eye-friendly lamps for the writing board in a classroom of Heshan No.1 Middle School]

Aligning with the GB 7793 standard, systematically implementing lighting renovation

This renovation was based on GB 7793—2010 / 2025 Hygienic Standard for Day Lighting and Artificial Lighting for Middle and Elementary School, focusing ondesk surface illuminance, writing board illuminance, illuminance uniformity and glare controland other key indicators, comprehensively optimizing the original lighting conditions, with emphasis on improving the core lighting areas used in classroom teaching.

[Figure 2: Overall classroom environment after eye-friendly lighting renovation]

Comparison of illuminance and key indicators before and after renovation

After lighting renovation and on-site testing, the lighting conditions of the relevant classrooms at Heshan No.1 Middle School improved significantly compared with before the renovation. The specific comparison is as follows:

Indicator ItemGB 7793 RequirementBefore RenovationAfter RenovationAverage desk surface illuminance≥300 lx180–220 lx380–420 lxAverage writing board illuminance≥500 lx300–350 lx650–720 lxDesk surface illuminance uniformity≥0.70.45–0.550.75–0.80Writing board illuminance uniformity≥0.80.55–0.650.82–0.85Glare controlShould be effectively controlledObvious local glare significantly improvedVisual comfort——Prone to visual fatigueComfort significantly improved

The test results show thatafter the renovation, the classroom desk surface and writing board lighting indicators all meet and comply with the requirements of the GB 7793 national standard, the classroom lighting environment quality has been significantly improved.

[Figure 3: On-site inspection of classroom lighting]

Strict inspection and acceptance to ensure the renovation results are genuine and reliable

After the lighting renovation was completed, relevant personnel used professional illuminance testing instruments to carry out multi-point measurements on students' desk surfaces and writing board areas, checking illuminance, uniformity and other indicators item by item against national standards, ensuring authentic data and reliable results, and providing a basis for subsequent use and management.

Continuously promote standardization construction to protect students' visual health

Improving the classroom lighting environment is an important foundation for implementing myopia prevention and control work. Next, the education department of Heshan City will continue to take national standards as the basis, steadily advance the improvement of primary and secondary school classroom lighting conditions, continuously enhance the quality of campus learning environments, and provide strong guarantees for the healthy growth of students.

Acceptance Report 1 Acceptance Report 1 Acceptance Report 1 Acceptance Report 1 Acceptance Report 1 Acceptance Report 1

Frequently Asked Questions

After a classroom lighting retrofit, what desk surface illuminance is required to comply with national standards?

According to GB 7793, the average illuminance on desk surfaces should be ≥300 lx. Before the retrofit, Heshan No.1 Middle School had only 180–220 lx; after the retrofit, it reached 380–420 lx, complying with national standards.

How much illuminance is sufficient for blackboard lights? Is there a big difference before and after the retrofit?

GB 7793 requires the average illuminance on writing boards to be ≥500 lx. Before the retrofit, Heshan No.1 Middle School had 300–350 lx; after the retrofit, it increased to 650–720 lx. The illuminance uniformity on writing boards also improved from 0.55–0.65 to 0.82–0.85.

How is acceptance inspection carried out after a classroom lighting retrofit, and is the data reliable?

After the renovation is completed, professional illuminance testing instruments are used to carry out multi-point measurements of student desk surfaces and writing board areas. Illuminance, uniformity, and other indicators are checked item by item against GB 7793 to ensure authentic data and reliable results.

What indicators are mainly considered in classroom lighting renovation?

Optimization mainly focuses on key indicators such as desk surface illuminance, writing board illuminance, illuminance uniformity, and glare control, with emphasis on improving the core lighting areas used in class. After renovation, glare is effectively controlled and visual comfort is significantly improved.