How to define the uniformity of illumination of LED eye protection classroom lights
We know that the national standard stipulates that the average illuminance of the desktop in the lighting class of the school classroom should not be less than 300lx, and the uniformity of the illuminance should not be less than 0.7. So how to define the uniformity of the light environment produced by the LED eye-protecting classroom lamp? Let's take a look now!
What is illuminance uniformity? Illumination uniformity refers to the ratio of small illuminance to average illuminance. The calculation formula is illuminance uniformity = small illuminance value/average illuminance value. If the average illuminance is 300lx, then the illuminance should not be lower than 210lx.
Here are the things to note:
1. Illuminance uniformity refers to the ratio of small illuminance to average illuminance, not the ratio of large illuminance, nor the ratio of other illuminances.
2. Illumination uniformity refers to the ratio of the small illuminance on the desk to the average illuminance, not the ratio of the illuminance to the average illuminance at other points in the classroom.
Therefore, the average illuminance in the classroom light environment generated by the LED eye protection classroom lamp should exceed 300lx, and the ratio of the small illuminance on the desk to the actual average illuminance should not be less than 70%, which is the ideal uniformity of illuminance. The more uniform the light distribution means the better the illuminance and the more comfortable the visual experience. The closer the illuminance uniformity is to 1, the better; on the contrary, the smaller it is, the more visual fatigue will increase. The uniformity of the school classroom desk illuminance cannot be less than 0.7.
