It should be 2.5-2.9m, and the distance from the desk should be1.7-2.1m.
2) Optical experiment table, microscope experiment table in biological laboratory, experiment table in geography classroom with simple planetarium or places where careful observation and recording are needed. Local lighting should be provided.
3) The control switch for classroom lighting should be arranged in parallel with the external window (the blackboard lighting switch should be installed separately). When there is a projection screen, the lighting switch near the projection screen should be set independently, and some corridor lighting should be turned off during class.
4) The lighting of the multimedia classroom should meet the requirements of vertical illumination, and the general lighting near the screen should be turned off independently, so that the screen content can be clearly seen and the normal visual requirements can be met.
5) The installation height of lamps has certain influence on the lighting effect. When the height of lamps increases and the illuminance decreases, the installation height decreases, the glare increases, the uniformity decreases, and the installation height of classroom lamps off the ground decreases.
6) Staircase classrooms (combined classrooms or lecture halls) have a large number of lamps, and the glare interference increases. It is advisable to choose lamps with good light limiting performance, such as lamps with grille or diffuse reflection plate (cover) and open lamps with large protection angle.
7) The lighting of classrooms such as painting and arts and crafts is generally the best with the skylight facing north. Therefore, in order to display objects more truly in the painting and arts and crafts classrooms, high color rendering light sources and indirect lighting should be used to truly display the shadows of objects.
8) In lecture halls, large classrooms and other places with TV teaching, lighting for taking notes and general lighting for TV teaching should be set, and general lighting should be dimmed.
9) A special board lamp should be set in front of the classroom blackboard, with an average vertical illumination greater than or equal to 200lx and a blackboard surface illumination uniformity greater than or less than 0.7. Special plate lamps with asymmetric light intensity distribution characteristics should be used. The protection angle of the side lamps of the student seat should be greater than 40 degrees, and direct glare should not be generated.
10) The lighting of the stacks should adopt narrow light distribution or other lamps with suitable light distribution, and the distance between the lamps and flammable articles such as books should be greater than 0.5rn. The distribution box for stack lighting should have power indicator light and be located outside the stacks, and the switches (controllable switches at both ends of the channels) should be set independently for stack channel lighting.
1 1) For the studio of the photo studio, the recommended vertical illumination (cultural performance) should be 1000- 1500lx. In the preliminary design, the power consumption of studio lighting is expected to be 0.6-0.8 km/m. When the height of the studio is less than 7m, track lighting should be used, and when it is more than 7m, fixed lighting can be used. Emergency lighting shall be provided when the workshop area exceeds 200rn'.
12) Layout principle of lighting fixtures. Arranged above the passage with the long axis perpendicular to the blackboard, the lighting effect is the best. If the horizontal light distribution of lamps is good, glare can be effectively controlled, the protection angle of lamps is large, the surface brightness of lamps is not much different from that of the ceiling, and the arrangement of lamps can also be parallel to the blackboard.
13) reading room lighting. When there is a suspended ceiling, it is necessary to use a hidden fluorescent lamp, and its general lighting should be controlled in parallel or shunt along the outer window. The socket setting in the reading room should be equal to or greater than 15% of the number of seats in the reading room.
14) computer classroom lighting. The influence of high brightness light sources such as lamps and windows on the display screen should be avoided, and lamps with bat-wing light intensity distribution characteristics should be selected.
15) One or more groups of power safety sockets should be set on the front and rear walls of ordinary classrooms and lecture halls (combined lecture halls).
16) Public lighting and work (office) lighting in the library should be distributed and controlled separately.