When installing LED classroom lights, special attention must be paid to safety, illuminance compliance, visual comfort, and future maintenance. Below is a detailed categorized explanation of the precautions👇:

🧱 I. Safety Specifications and Installation Preparation

1. Power off before work:
   Before installation, the power supply must be cut off and no-power operation confirmed to avoid electric shock risk.
2. Check power supply compatibility:
   • Confirm that the rated voltage of the luminaire (generally AC220V) matches the on-site power supply.
   • If low-voltage luminaires are used (such as DC 24V), a compatible safety power supply must be provided.
3. Check ceiling load-bearing capacity and fixing structure:
   • The classroom ceiling must be able to bear the weight of the luminaires.
   • Useexpansion bolts or dedicated hangersfor fixing. It is strictly prohibited to drill holes randomly with wood screws.
4. Fire prevention and wiring safety:
   • Use flame-retardant wiring (≥1.5mm² copper wire).
   • Maintain a distance of ≥30mm between luminaires and combustible materials.
   • It is recommended to use metal trunking or flame-retardant PVC conduit for wiring.

💡 II. Lighting Standards and Luminaire Layout

(Refer to GB 7793-2025 Hygienic Standard for Daylighting and Lighting in Primary and Secondary Schools)

1. Illuminance Requirements:
   • General classrooms: average illuminance on desk surface ≥ 300 lx; uniformity ≥ 0.7
   • Blackboard illuminance ≥ 500 lx; uniformity ≥ 0.8
2. UGR Value (Anti-Glare):
   The unified glare rating UGR of classroom luminaires shall be ≤ 19 to prevent students' visual fatigue.
3. Color Temperature and Color Rendering Index:
   • Color temperature: 4000K~5000K (close to natural light)
   • Color rendering index Ra ≥ 90, which is beneficial to visual clarity and color recognition.
4. Installation height and spacing:
   • The lower edge of the luminaire is generally ≥ 2.6m from the ground
   • The spacing shall be designed according to "uniform spacing luminaire layout" or "staggered luminaire layout" to achieve uniform illuminance
   • Blackboard luminaires should be tilted about 15° to avoid direct glare into students' eyes.

🔌 III. Electrical connection and control system

1. Wiring specifications:
   • The connections of L, N, and ground wire (yellow-green wire) must be firm.
   • It is recommended to use quick-connect terminals to avoid loose connections or short circuits.
2. Intelligent control system(if micro-control or centralized control is used):
   • Confirm that communication lines (such as RS485 / Zigbee) are separated from power lines.
   • Test the dimming response and grouping logic of each group of luminaires.
   • Reserve a manual emergency switch.

🧰 IV. Commissioning and Acceptance

1. Lighting test:
   Confirm no flicker, no noise, consistent color temperature, and uniform illuminance.
2. Illuminance measurement:
   Anti-glare inspection
3. :Labeling and maintenance records
   :
4. Use an illuminance meter to measure at multiple points on the desk surface, in compliance with national standards.Observe the luminaires from different angles to confirm they do not shine directly into students' line of sight.
   Record the model, installation position, and circuit number of each luminaire for future maintenance.

🧒 V. Special recommendations for classroom use environments

• Avoid blue light hazards: Choose luminaires with national test reports and a blue light hazard rating of RG0 (no hazard).
• Avoid flicker: Useflicker-free driver power supplies, which can be checked with a phone's slow-motion camera.
• Cleaning and maintenance: Regularly clean lamp shades to prevent dust and insects and maintain illuminance.
• Separate circuit control for blackboard lights and desk lights: Facilitates flexible dimming according to teaching scenarios