Classroom lamps are parallel to the blackboard reasonable or perpendicular to the blackboard reasonable, each with what advantages and disadvantages

First of all, it depends on what kind of lamps and lanterns, what kind of light distribution and what kind of glare of this lamps and lanterns, classroom lamps and lanterns commonly used usually have a hooded bracket, lamp plate, ceiling lamps, chalkboard lamps.

The most commonly used and most economical hanging line with hooded bracket, usually parallel to the blackboard is more reasonable, because classroom lighting is usually the assessment of the average illumination of the work surface, illumination uniformity, glare control of the three points, (not discussing the vertical surface of the blackboard illumination), the direction of the lamps and lanterns do not affect the average illumination of the work surface, but from a certain level of impact on the uniformity of illumination and glare control.

The problem of uniformity: if the lamps are parallel to the blackboard, then a row of tables on the desktop illuminance is uniform, after a row of tables or a row of tables before the illuminance is also uniform; if perpendicular to the blackboard, then a column of children's table illuminance is uniform, and the left and right table desktop illuminance is not uniform.

Glare control problem: the hooded bracket is usually used T8 tubes, T8 tubes from the side, the glare is not strong, from the end of the face, because of the angle of the problem, seems to be compressed length (looks shorter), the brightness is increased, the glare is strong. And the hooded bracket has a hood on the side, and from a distance it looks like the hood is covering the light source and controlling the glare, the end face is not covered and there is glare from farther away.

In summary, hooded stands should usually be arranged parallel to the board. Of course if you're not using a hooded bracket, or your classroom is a different width and height, then you can keep consulting me.