School lighting standards and testing methods

This country has standards for school lighting. You can measure the ground illumination (or desktop) with an illuminance meter, and it is best to draw curtains at night (excluding the influence of external light during the day). It should be around 300Lx (if it is a lecture hall or auditorium, it may be lower than 250Lx). If it is lower than this value, it needs to be analyzed.

The light source has light decay.

First of all, is the light source decaying? (It is normal that general lamps and lanterns will reduce the amount of light emission with the increase of use time. Generally, less than 70% of new products will be replaced, but in order to reduce expenses, properties are often used until dawn. Because the illuminance meter is calculated according to the light attenuation of 70%.

Design problem

If the illumination is still low after using the new light source, it may be that there is something wrong with the original design. Need to add a light source.

The outdoor light is very strong during the day.

If the illumination is ok, it is recommended not to add it. Because the outdoor light is very strong during the day, the indoor desktop illumination must be higher than 300Lx. Whether to use the classroom after 6 pm is another matter.

fluorescence

Fluorescent lamps (straight fluorescent lamps) are generally used in classrooms and offices, and URG (dazzling Chengdu) is below 19. LED is not recommended. The domestic light efficiency (poor color rendering, URG) is not good, and the imported ones are too expensive.