The measurement and analysis of classroom illumination

The classroom as the main place of students learning, the stand or fall of its lighting environment directly affect the students' vision, with the fatigue of the eye and attention. So a healthy scientific illumination environment is one of the necessary conditions for students to learn. At the present stage our country's schools are basically adopt the way of combination of natural light and artificial lighting lighting. Today, I mainly introduce what I tested two classroom, under the condition of total artificial lighting lighting effect can achieve. In 2004 in China issued and implemented a GB50034 - 2004 'building lighting design standard', clearly stipulated in the standard of our country standard school building lighting, it also lists some regulations of other countries for reference, I selected and associated parts of classroom illumination requirements listed in table 1. In the table we can see some national standards while develop earlier than the domestic, but the standard is higher than our new standard.

the classroom table 1 standard contrast (both at home and abroad Unit: lx)

in order to obtain ideal accurate test data, we arrange the test time after seven o 'clock in the evening, it's completely dark before he started testing. The measurement of two same classroom test area, test area are shown in figure 1 and figure 2 below. 1 light source used in the classroom for PHILIPS 36 w T8 6500 k pairs of fluorescent lamp. 2 the classroom light source for sanki the T6 L1336W / 864 double-end fluorescent lamp. Both the lamps and lanterns of the classroom for 6 2 x 36 w grille lamp. The area of each desk to 1. 2×0. 6 m, horizontal illuminance test points in the geometric center of the desktop. At the level of vertical center line of the blackboard, taking three points measuring vertical illuminance. Test time is 20 minutes after the lamps and lanterns lit to begin testing. The environment temperature 22 ℃. Figure 1

the classroom test plan

2 map test results are shown in table 2. By the measured data analysis: the two classroom illumination level basically all reached GB50034 - 2004 'building lighting design standard' requirements. Two kinds of light source color rendering index have reached more than 80, in line with the requirements of the classroom. Lamps and lanterns USES little barrier, and the height of the suspension are relatively high, so as to effectively prevent the glare. The other lamps and lanterns are made with matching electronic ballasts, basic to eliminate the stroboscope. The classroom as long as the light source for regular replacement, maintain the cleanness of especially reflector lamps and lanterns of lamps and lanterns, can keep the illumination level, so to student's health with the eye also can make a big help.

a lot of data to prove: high efficiency, high light efficiency, no stroboscopic lamp, high intensity of illumination, the classroom no stroboscopic, uniform illumination, no glare, good color rendering, will give students a good reading environment, reduce the visual fatigue, reduce the occurrence and development of myopia. And students in poor reading light, strobe light, low intensity of illumination, low uniformity, existing glare, make be according to the object contrast, resolution to reduce the human eye, long time reading more easily cause visual fatigue in this light, will cause eye fatigue for a certain period in the development of myopia. Many students will be in the classroom at night self-study, under this kind of lighting reading every day time is longer, this is also the cause of higher incidence of malvision, new. Lighting is one of the major factors influence study, work environment. The classroom lighting quality directly affect the students' vision health and learning efficiency. Because of technology and economy, our country school lighting has remained at the levels of relatively backward.

in recent years, in the country built a lot of new buildings, although the classroom lighting has certain improvement and improve, but overall lighting still stay in our school is very backward status: the classroom lighting design, unreasonable layout, use the lamps and lanterns of crude, aging, use the light source of low light efficiency, causing stroboscopic light, low intensity of illumination, low uniformity, existing glare. Behind the classroom lighting quality affects the students' vision health and learning efficiency. Therefore, in order to protect students vision, improve the learning efficiency, for the students to create a healthy and comfortable, the highly effective learning environment, it is necessary to increase and improve the quality of classroom lighting.