According to the Chinese national standard "GB 50034-2013 Architectural Lighting Design Standard" and the relevant requirements of the Ministry of Education, the lighting brightness (illuminance) standards for school classrooms are as follows:
1. Classroom desktop illumination standards
Ordinary classrooms (blackboards, desks):
≥300 lux (minimum requirement of national standards)
Recommended value: 300~500 lux (balanced and comfortable, avoiding glare)
Multimedia classrooms/laboratories:
≥500 lux (higher brightness is required to match the screen or experimental operation)
Local blackboard lighting:
≥500 lux (dedicated blackboard lamp to avoid reflection)
2. International reference standards (CIE/ISO)
The International Commission on Illumination (CIE) recommends:
General area of the classroom: 300~500 lux
Fine task area (such as drawing room): above 750 lux
3. Key influencing factors
(1) Light source type
LED lamps:
Recommended color temperature 4000K~5000K (neutral white, conducive to concentration).
Color rendering index (Ra) ≥95 (to ensure the true color of the textbook).
Avoid flicker (strobe frequency > 3125Hz) and glare (grid or diffuse reflection design is recommended).
(2) Lighting layout
Uniformity requirements (minimum illumination/average illumination):
Desktop ≥0.7, blackboard ≥0.8 (to avoid uneven brightness).
Installation method:
The distance between the lamp and the front edge of the blackboard is ≥0.6m, and it is arranged parallel to the blackboard.
The desk area requires about 3~5W LED power per square meter (for example, a 30㎡ classroom requires 90~150W total power).
(3) Natural light supplement
Natural lighting should be combined during the day, but direct sunlight should be avoided (it is recommended to use blackout curtains for adjustment).
4. Practical application case
9m×6m standard classroom (54㎡):
Number of lamps: 9~12 LED panel lights (20~30W each, 4000K).
Measured illumination: about 350~450 lux in the center of the desktop, and more than 500 lux in the blackboard area.
5. Common problems
Insufficient illumination:
Phenomenon: students are prone to fatigue and the risk of myopia increases.
Solution: add lamps or replace with higher light efficiency LEDs (such as 120lm/W or more).
Excessive lighting:
Phenomenon: glare, energy waste.
Solution: reduce power or adjust the angle of the lamp.
The desktop of an ordinary classroom should be guaranteed to be 300~500 lux, and the blackboard area should be more than 500 lux, while paying attention to the quality and uniformity of the light source.
It is recommended to use a professional illuminance meter for testing, or entrust a lighting design unit to optimize the plan (especially for new/renovated classrooms).
If specific lamp configuration calculation is required, information such as classroom size and window position can be provided for further analysis , you can consult on http://www.benweilight.com
