Nowadays, more and more students are short-sighted. One […]
Nowadays, more and more students are short-sighted. One of the factors affecting students' vision is lighting. In order to protect the eyes of the students, the school must pay attention to the layout of the classroom lighting. How should the classroom lighting be selected?
The first choice is to focus on lamp efficiency
The efficiency of the lamp is the percentage of the luminous flux emitted by the entire lamp to the luminous flux emitted by all the light sources of the lamp. It is one of the important parameters to measure whether a lamp is energy efficient. The higher the efficiency of the lamp, the more effectively the lamp can use the light flux of the light source; otherwise, the lower the efficiency, the more energy is wasted. Therefore, managers should pay attention to reasonable matching when choosing, to ensure the comfort of children while reducing energy use.
The second is the light distribution shape of the lamp.
Classroom lamps commonly used today include small grille lamps and large grille lamps. The light distribution shape of general small grille lamps is cosine light distribution. The maximum light intensity of this kind of lamp is basically under the lamp, the light intensity directed to the surroundings is very low, and the luminous flux is concentrated in the lower part of the lamp. If you want to achieve the high uniformity of illumination required by the standard, you can only increase the number of lamps used, otherwise the classroom will be light and dark, and the uniformity of illumination will be low. The light distribution shape of the larger grille can be made into bat wings. These must be considered according to the specific situation of the classroom, everyone must choose reasonably.
Another is the glare quality level of the lamp
The glare quality level of the luminaire is divided according to GBJ133 "Civil Building Lighting Design Standard" using the luminaire brightness limit curve test method. We conducted a glare quality level test on common grille lamps used in classrooms. The number of samples tested was: 5 large grille lamps and 13 small grille lamps. From the quantitative relationship, the glare quality level of small grille lamps is generally better than large grille lamps. Generally, small grid luminaires can reach A level when 500lx ≤ use illuminance ≤ 1000lx; while large grid luminaires mostly reach A level only when 300lx ≤ use illuminance ≤ 500lx or lower.