CN207471260U - Blackboard lamps and lighting systems with group control - Google Patents

Abstract

the utility model provides a blackboard lamp and lighting system that group was regulated and control, blackboard lamp that group was regulated and control includes light source plate group, L ED banks, arrange and set up in light source plate group top, and be connected with light source plate group, optical lens group, set up in light source plate group top, and be connected with light source plate group, L ED banks arranges in optical lens group's recess, power drive subassembly, set up in light source plate group below, and electrically communicate with L0 ED banks, L1 ED banks includes first L ED banks and the second L ED banks of establishing ties mutually, first L ED banks with second L ED banks all includes two at least light source groups and establishes ties in the same L ED banks, and a plurality of L lamps of every light source group all parallel connection.

Description

Blackboard lamps and lighting systems with group control

technical field

The utility model belongs to the technical field of blackboard lamp lighting, and more specifically relates to a blackboard lamp and a lighting system for group control.

Background technique

As the carrier of knowledge transmission between teachers and students, the blackboard’s lighting environment directly affects the efficiency and effect of classroom teaching, and also affects the eyesight and eye fatigue of teachers and students. Blackboard lighting is installed vertically. Blackboard lights are generally set above the side of the blackboard. The lighting needs to meet the following requirements: (1) to enable students to see the blackboard clearly; (2) the light of the blackboard lights does not directly enter the eyes of students; (3) Better uniformity is achieved on the blackboard surface. The blackboard lights in the prior art usually use the method of increasing its luminous power to fully illuminate the blackboard so that students can see the blackboard clearly; to avoid the problem of direct light from the blackboard light entering the students' eyes, the light source can be illuminated by reflectors and light baffles. The light to the students is blocked and does not directly enter the eyes of the students, but the blackboard lamp design of the light uniformity of the light on the blackboard is different.

At present, traditional T8 light tubes and LED (Light Emitting Diode, light-emitting diode) blackboard lights are often used for blackboard lighting in school classrooms. Traditional T8 tubes only use a combination of T8 tubes with the same brightness and the same wattage or a single T8 tube to illuminate the blackboard, so that the uniformity of illumination on the blackboard surface is poor, and the lighting effect is not ideal, or only a single light source board group is used. Through optical design To illuminate the blackboard, it will also make the blackboard lighting uneven.

Utility model content

The purpose of the utility model is to provide a blackboard lamp and lighting system controlled by groups, aiming to solve the problem of uneven illumination of the blackboard lamps on the blackboard in the prior art.

In order to achieve the above purpose, the first aspect of the utility model provides a group control blackboard lamp, including:

Light source board group;

The LED lamp group is arranged on the light source board group and connected with the light source board group;

The optical lens group is a cavity structure, arranged above the light source board group, and connected with the light source board group; the LED lamp group is placed in the groove of the optical lens group;

The power drive component is arranged under the light source board group and is electrically connected to the LED lamp group;

The LED lamp group includes: a first LED lamp group and a second LED lamp group connected in series;

Both the first LED lamp group and the second LED lamp group include at least two light source groups, and the two light source groups in the same LED lamp group are connected in series;

At least two light source groups in the same LED lamp group each include a plurality of LED light sources, and the numbers of LED light sources in at least two light source groups in the same LED lamp group are different;

Multiple LED light sources in each light source group are connected in parallel.

Optionally, the light source board group includes a first light source board group and a second light source board group;

The first LED lamp group is arranged on the first light source board group, and the second LED lamp group is arranged on the second light source board group.

Optionally, the optical lens group includes a first lens group and a second lens group;

The first LED light group is placed in the groove of the first lens group, and the second LED light group is placed in the groove of the second lens group;

The height of the first lens group is higher than the height of the second lens group;

Both the first lens group and the second lens group include a plurality of lenses, and the lenses are provided with grooves.

Optionally, the lens is correspondingly provided with a light incident surface, a light exit surface and a light incident side;

The light incident surface is a concave light surface protruding toward the light source board group, connected to the light incident side;

The light incident side is perpendicular to the light source board group, and forms a groove of the lens with the light incident surface;

The LED light source is placed in the groove of the lens;

The light emitting surface is placed above the light incident surface;

The light-emitting surfaces of the plurality of lenses are all connected;

The size of the light incident surface is smaller than the size of the light output surface;

The sizes of the light-emitting surfaces of the lenses of the first lens group are larger than the sizes of the light-emitting surfaces of the lenses of the second lens group.

Optionally, the lens further includes: a side light-blocking wall, respectively connected to the light-emitting surface and the light-incoming side, for reflecting the light emitted by the LED light source toward the blackboard or the wall.

Optionally, the light source board group further includes a third light source board group;

The LED lamp group also includes a third LED lamp group;

The optical lens group also includes a third lens group;

The third LED lamp group is arranged on the third light source board group, and the third LED lamp group is placed in the third lens group;

The size of the light exit surface of the lenses of the third lens group is the same as that of the light exit surface of the lenses of the second lens group, and the height of the third lens group is the same as that of the second lens group.

Optionally, the blackboard lamp also includes: a housing;

The light source board group, the LED lamp group, the optical lens group and the power drive assembly are all placed inside the bottom of the housing and inclined toward the blackboard or the wall.

Optionally, the housing includes: a first side and a second side;

The height of the first side is higher than that of the second side.

Optionally, the blackboard light further includes a mounting bracket arranged above the housing.

The second aspect of the utility model provides a lighting system, including any of the above-mentioned blackboard lamps controlled by groups.

The beneficial effect of the group control blackboard lamp provided by the utility model lies in that: compared with the prior art, the utility model includes a light source board group; LED lamp groups are arranged above the light source board group, and are all connected to the light source board group. group connection; the optical lens group is arranged above the light source board group and connected with the light source board group, and the LED lamp group is placed in the groove of the optical lens group; the power drive component is arranged under the light source board group, and conducts with the LED lamp group pass; the LED lamp group includes a first LED lamp group and a second LED lamp group connected in series; the first LED lamp group and the second LED lamp group each include at least two light source groups connected in series, and each light source group A plurality of LED lamps are connected in parallel to realize different input currents of each LED light source, that is, different light intensity, and improve the uniformity of light illumination of the blackboard lamp on the blackboard.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the practical For some novel embodiments, those skilled in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is the structural schematic diagram of the group control blackboard lamp provided by the embodiment of the present invention;

Fig. 2 is a specific structural schematic diagram of the group-controlled blackboard lamp provided by the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of the light source panel group provided by the embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an optical lens group provided by an embodiment of the present invention;

Fig. 5 is a schematic diagram of the circuit structure of the connection of the LED light source in the LED lamp group provided by the embodiment of the present invention;

Fig. 6 is a schematic diagram showing the effect of group-controlled blackboard lights on the blackboard provided by the embodiment of the present invention;

Fig. 7 is a schematic diagram of the experimental results of the vertical and horizontal uniformity of the light illuminated on the blackboard by a group-controlled blackboard lamp provided by the embodiment of the present invention;

Fig. 8 is a schematic diagram of the experimental results of the vertical and horizontal uniformity of the light illuminated on the blackboard by another group control blackboard lamp provided by the embodiment of the present invention;

FIG. 9 is a schematic structural diagram of another blackboard lamp with group control provided by the embodiment of the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Embodiment one

Referring to FIG. 1 and FIG. 2 , a group control blackboard lamp provided by an embodiment of the present invention includes a light source board group 100 , an LED lamp group 200 , an optical lens group 300 and a power drive assembly 400 .

The LED lamp group 200 is arranged on the light source board group 100 and connected with the light source board group 100 .

The optical lens group 300 is a cavity structure, arranged above the light source board group 100 and connected with the light source board group 100 ; the LED lamp group 200 is placed in the groove of the optical lens group 300 .

The power drive assembly 400 is arranged under the light source board group 100 and electrically connected with the LED lamp group 200 .

The LED lamp group 200 includes: a first LED lamp group 201 and a second LED lamp group 202 connected in series.

Both the first LED lamp group 201 and the second LED lamp group 202 include at least two light source groups, and the two light source groups in the same LED lamp group are connected in series.

At least two light source groups in the same LED lamp group each include a plurality of LED light sources, and the numbers of the LED light sources contained in the at least two light source groups in the same LED lamp group are different.

A plurality of LED light sources included in each light source group are connected in parallel.

The blackboard lights controlled by groups are connected in series by at least two light source groups of the first LED light group 201 and the second LED light group 202 in the LED light group 200, and the parallel connection mode of multiple LED light sources of the two light source groups , and the numbers of the LED light sources in at least two light source groups are different, so that the input current of each LED light source is different, that is, the illumination intensity is different, and the uniformity of illumination of the blackboard lamp on the blackboard is improved.

Further, referring to FIG. 2 , in one embodiment, the light source board group 100 includes a first light source board group 101 and a second light source board group 102 .

The first LED lamp group 201 is arranged on the first light source board group 101 , and the second LED lamp group 202 is arranged on the second light source board group 102 .

Further, referring to FIG. 3 , the first light source board group 101 includes a light source hole 1011 and a lens hole 1012 .

The light source hole 1011 is used for fixing the plurality of LED light sources. Specifically, at least two columns of light source holes 1011 are arranged on the first light source board group 101 . Exemplarily, two rows of light source holes 1011 are provided on the first light source board group 101 for fixing multiple LED light sources of the two light source groups of the first LED lamp group 201 , that is, the first row fixes one of the first LED lamp group 201 Multiple LED light sources of the light source group, and the second column fixes multiple LED light sources of another light source group of the first LED lamp group 201 . The light source hole 1011 is connected to the multiple LED light sources of the two light source groups of the first LED lamp group 201 through fixing means, such as screws, screws and bolts.

The lens hole 1012 is used for fixing the optical lens group 300 . The lens hole 1012 includes two sets of lens fixing holes, one set is used for fixing one end of the optical lens group 300 , and the other set is used for fixing the other end of the optical lens group 300 . The lens hole 1012 and the optical lens group 300 can be connected by a fixing device, such as screws, screws and bolts.

Optionally, the second light source board group 102 includes a light source hole 1021 and a lens hole 1022 .

Specifically, at least two columns of light source holes 1021 are arranged on the second light source board group 102 . Exemplarily, two rows of light source holes 1021 are provided on the second light source board group 102 for fixing multiple LED light sources of the two light source groups of the second LED lamp group 202 , that is, the first row fixes one of the second LED lamp group 202 Multiple LED light sources of the light source group, and the second column fixes multiple LED light sources of another light source group of the second LED lamp group 202 . The light source hole 1021 is connected to the multiple LED light sources of the two light source groups of the second LED lamp group 202 through fixing means, such as screws, screws and bolts.

The lens hole 1022 is used for fixing the optical lens group 300 . The lens hole 1012 includes two sets of lens fixing holes, one set is used for fixing one end of the optical lens group 300 , and the other set is used for fixing the other end of the optical lens group 300 . The lens hole 1022 and the optical lens group 300 can be connected by a fixing device, such as screws, screws and bolts.

Further, in one embodiment, the LED lamp group 200 is arranged above the light source board group 100 and connected with the light source board group 100 .

Specifically, the LED lamp group 200 includes: a first LED lamp group 201 and a second LED lamp group 202 connected in series.

Further, referring to FIG. 5 , both the first LED lamp group 201 and the second LED lamp group 201 include at least two light source groups, at least two light source groups in the same LED lamp group are connected in series, and at least two light source groups in the same LED lamp group The light source groups each include a plurality of LED light sources.

Exemplarily, the first LED light group 201 and the second LED light group 202 both include two light source groups, each light source group includes a plurality of LED light sources, and each of the plurality of LED light sources included in the light source group is parallel connect. Optionally, each of the LED light sources may be an LED lamp bead, but the LED light source is not limited to be an LED lamp bead.

Further, the number of LED light sources included in the two light source groups in the same LED lamp group is different, so that the input currents of the two light source groups in the same LED lamp group can be different, and each light source group includes a plurality of parallel The input currents of the LED light sources are also different, that is, the luminance of each LED light source is different, and the brightness and range of each LED light source shining on the blackboard are also different.

Optionally, the ratio of the input currents of the two light source groups in the same LED lamp group may be 1:1, 1.2:1, 1.4:1, 1.6:1, 1.8:1 or 2:1.

Preferably, the ratio of the input currents of the two light source groups in the same LED lamp group in this embodiment is 1.4:1, wherein, the number of LED light sources included in one light source group is 5, and the 5 LED light sources are parallel The number of LED light sources included in the other light source group is 7, the 7 LED light sources are connected in parallel, and the two light source groups are connected in series. Specifically, refer to FIG. 7 , which is a schematic diagram of the experimental results of the vertical and horizontal uniformity of the light illuminated on the blackboard by a group-controlled blackboard lamp provided by an embodiment of the present invention. The graph on the left of Fig. 7 represents the surface illuminance value distribution diagram of the group control blackboard lamp; in the graph on the right of Fig. 7, the upper curve represents the longitudinal illuminance distribution of the blackboard surface, and the lower curve represents the blackboard lateral illuminance distribution. When the ratio of the input currents of the two light source groups is 1.4:1, the longitudinal uniformity of the blackboard is greater than 0.85, and the longitudinal uniformity of the blackboard=minimum blackboard brightness/average blackboard brightness. In this embodiment, the number of LED light sources included in each light source group is not limited.

Optionally, in one embodiment, the first LED lamp group 201 and the second LED lamp group 202 may include three light source groups, and the three light source groups are connected in series. Each light source group in the same LED light group includes a plurality of LED light sources, and the plurality of LED light sources included in each light source group are connected in parallel. Optionally, each of the LED light sources may be an LED lamp bead, but the LED light source is not limited to be an LED lamp bead.

Further, the number of LED light sources included in the three light source groups in the same LED lamp group is different. Specifically, the number of LED light sources in each light source group is different, so that the input currents of the three light source groups in the same LED light group can be different, and the input currents of the multiple parallel-connected LED light sources included in each light source group are also different. Not the same, that is, the luminance of each LED light source is different, and the brightness and range of each LED light source shining on the blackboard are also different.

Optionally, the ratio of the input currents of the three light source groups in the same LED lamp group may be 1:1:1, 1.2:0.8:0.6 or 1.4:0.8:0.6. Preferably, the ratio of the input currents of the three light source groups in the same LED lamp group in this embodiment is 1.4:0.8:0.6. Specifically, refer to FIG. 8 , which is a schematic diagram of experimental results of the vertical and horizontal uniformity of light illuminated on a blackboard by another group-controlled blackboard lamp provided by an embodiment of the present invention. The graph on the left of Fig. 8 represents the surface illuminance value distribution diagram of the group control blackboard lamp; in the graph on the right of Fig. 8, the upper curve represents the longitudinal illuminance distribution of the blackboard surface, and the lower curve represents the blackboard lateral illuminance distribution. When the ratio of the input currents of the three light source groups is 1.4:0.8:0.6, the longitudinal uniformity of the blackboard is greater than 0.7. In this embodiment, the number of LED light sources included in each light source group is not limited.

Further, referring to FIG. 4 , in one embodiment, the optical lens group 300 is a cavity structure, disposed above the light source board group 100 and connected to the light source board group 100 . The LED lamp group 200 is placed in the groove of the optical lens group 300 .

Optionally, the optical lens group 300 includes a first lens group 301 and a second lens group 302 .

The first LED lamp group 201 is placed in the groove of the first lens group 301 , and the second LED lamp group 202 is placed in the groove of the second lens group 302 . The height of the first lens group 301 is higher than that of the second lens group 302 . Specifically, at least two light source groups of the first LED light group 201 are placed in the first lens group 301 , and at least two light source groups of the second LED light group 202 are both placed in the second lens group 302 .

Optionally, both the first lens group 301 and the second lens group 302 include a plurality of lenses, and the lenses are provided with grooves.

Further, since the number of LED light sources included in at least two light source groups of the first LED lamp group 201 is different, the LED light sources included in the at least two light source groups of the first LED lamp group 201 are all placed in all of the first lens group 301 The groove of the lens, that is, the groove of the lens of the first lens group 301 may include at least one LED light source.

The number of LED light sources included in at least two light source groups of the second LED lamp group 202 is different, and the LED light sources included in at least two light source groups of the second LED lamp group 202 are all placed in the concave of the lens of the second lens group 302 The groove, that is, the groove of the lens of the second lens group 302 may include at least one LED light source.

Further, referring to Fig. 2 and Fig. 4, the lens is correspondingly provided with a light incident surface, a light exit surface and a light incident side surface.

Exemplarily, the lenses of the first lens group 301 are correspondingly provided with: a light incident surface 3011 , a light exit surface 3012 and a light incident side surface 3013 .

The light incident surface 3011 is a concave light surface protruding toward the light source board assembly 100 , and is connected to the light incident side surface 3013 .

The light incident side 3013 is perpendicular to the light source board group 100 , and forms the groove of the lens with the light incident surface 3011 .

The light emitting surface 3012 is placed above the light incident surface 3011 and is a curved surface of the optical microstructure array.

The size of the light incident surface 3011 is smaller than the size of the light output surface 3012 .

Optionally, the lenses of the first lens group 301 are further provided with: side light blocking walls 3014 .

The side light blocking wall 3014 is respectively connected with the light emitting surface 3012 and the light incident side 3013, and is used to reflect the light emitted by the LED light source towards the blackboard or the wall, so as not to irradiate the light emitted by the LED light source to the students and teachers. It will not cause eye fatigue etc. to students and teachers.

Exemplarily, the lenses of the second lens group 302 are correspondingly provided with: a light incident surface 3021 , a light exit surface 3022 , a light incident side surface 3023 and a side light blocking wall 3024 . The dimensions of the light-emitting surfaces 3022 of the lenses of the second lens group 302 are all smaller than the dimensions of the light-emitting surfaces 3012 of the lenses of the first lens group 301 .

Specifically, the optical lens group 300 can shrink the light emitting angle of the LED light source of the LED lamp group 200 to 5 ^° -30 ^° . Wherein, the size of the light-emitting surface 3012 of the lens of the first lens group 301 is greater than the size of the light-emitting surface 3022 of the lens of the second lens group 302, combined with the height of the first lens group 301 is higher than the height of the second lens group 302 , so that the light angles emitted by the LED light sources in the first LED light group 201 and the light angles emitted by the LED light sources in the second LED light group 202 are also different.

Specifically, refer to FIG. 6 , which is a schematic diagram showing the effect of the blackboard lamps regulated by groups according to the embodiment of the present invention on the blackboard. The first LED light group 201 shines on the upper half of the blackboard through the lens 301 of the first lens group. area, the second LED light group 202 illuminates the lower half area of the blackboard through the lens 302 of the second lens group, that is, the LED light group 200 can evenly illuminate the entire area of the blackboard through the optical lens group 300 .

In practical application, the material of each lens 301 in the optical lens group 300 is PC (Polycarbonate, polycarbonate) material, PMMA (Polymeric Methyl Methacrylate, acrylic) material, glass or silicone material. Preferably, the lens 301 is made of PC material. Those skilled in the art should understand that the PC material has high transparency, good stability, and is tasteless, odorless, harmless to the human body, and conforms to hygienic safety.

Further, in an embodiment, the blackboard lamp further includes: a casing 600 .

The light source board group 100, the LED lamp group 200, the optical lens group 300 and the power drive assembly 400 are all placed inside the bottom of the casing 600, and are inclined towards the direction close to the blackboard or the wall.

Optionally, the housing 600 includes: a first side 601 and a second side 602 .

The height of the first side 601 is higher than that of the second side 602 .

Further, in one embodiment, the blackboard light further includes a mounting bracket 500 disposed above the housing.

The blackboard lamps controlled by groups are connected in series through the first LED lamp group 201 and the second LED lamp group 202 in the LED lamp group 200, and the first LED lamp group 201 and the second LED lamp group 202 each include at least two light source groups connected in series , at least two light source groups of the same LED lamp group each include a plurality of LED light sources connected in parallel, and the number of the LED light sources contained in at least two light source groups of the same LED lamp group is different, realizing that each of the LED light sources The input current is different, that is, the light intensity is different, which improves the light uniformity of the blackboard lamp on the blackboard.

Embodiment two

Referring to FIG. 9 , it is a schematic structural diagram of another group control blackboard lamp provided by an embodiment of the present invention. In the blackboard lights controlled by groups in the above embodiment, the light source board group 100 further includes a third light source board group 103 .

In this embodiment, the structure of the third light source panel group 103 is the same as that of the first light source panel group 101 and the second light source panel group 102 , which will not be repeated here.

The LED lamp group 200 further includes: a third LED lamp group 203 . The third LED lamp group 203 is disposed on the third light source board group 103 .

In this embodiment, the structure of the third LED light group 203 is the same as that of the first LED light group 201 and the second LED light group 202 , and details are not repeated here.

The optical lens group 300 also includes a third lens group 303 . The third LED lamp group 203 is placed in the groove of the third lens group 303 .

In this embodiment, the structure of the third lens group 303 is the same as that of the second lens group 302 , which will not be repeated here.

The group controlled blackboard light described in this embodiment has the beneficial effects of the above group controlled blackboard light.

Embodiment three

A lighting system, comprising the blackboard light controlled by group in any one of the above embodiments, has the beneficial effect of the above blackboard light controlled by group.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. A group control blackboard lamp, characterized in that it comprises: Light source board group; The LED lamp group is arranged on the light source board group and connected with the light source board group; The optical lens group is a cavity structure, arranged above the light source board group, and connected with the light source board group; the LED lamp group is placed in the groove of the optical lens group; The power drive component is arranged under the light source board group and is electrically connected to the LED lamp group; The LED lamp group includes: a first LED lamp group and a second LED lamp group connected in series; Both the first LED lamp group and the second LED lamp group include at least two light source groups, and the two light source groups in the same LED lamp group are connected in series; At least two light source groups in the same LED lamp group each include a plurality of LED light sources, and the numbers of LED light sources in at least two light source groups in the same LED lamp group are different; Multiple LED light sources in each light source group are connected in parallel. 2. The group control blackboard lamp according to claim 1, wherein the light source board group comprises a first light source board group and a second light source board group; The first LED lamp group is arranged on the first light source board group, and the second LED lamp group is arranged on the second light source board group. 3. The group control blackboard lamp according to claim 1, wherein the optical lens group comprises a first lens group and a second lens group; The first LED light group is placed in the groove of the first lens group, and the second LED light group is placed in the groove of the second lens group; The height of the first lens group is higher than the height of the second lens group; Both the first lens group and the second lens group include a plurality of lenses, and the lenses are provided with grooves. 4. The group controlled blackboard lamp according to claim 3, wherein the lens is correspondingly provided with a light incident surface, a light exit surface and a light incident side; The light incident surface is a concave light surface protruding toward the light source board group, connected to the light incident side; The light incident side is perpendicular to the light source board group, and forms a groove of the lens with the light incident surface; The LED light source is placed in the groove of the lens; The light exit surface is placed above the light incident surface; the light exit surfaces of the plurality of lenses are all connected; The size of the light incident surface is smaller than the size of the light output surface; The sizes of the light-emitting surfaces of the lenses of the first lens group are larger than the sizes of the light-emitting surfaces of the lenses of the second lens group. 5. The group control blackboard lamp according to claim 4, wherein the lens further comprises: a side light blocking wall, respectively connected to the light-emitting surface and the light-incoming side, for facing the blackboard or the wall The body reflects the light emitted by the LED light source. 6. The group control blackboard lamp according to claim 3, characterized in that, The light source board group also includes a third light source board group; The LED lamp group also includes a third LED lamp group; The optical lens group also includes a third lens group; The third LED lamp group is arranged on the third light source board group, and the third LED lamp group is placed in the third lens group; The size of the light-emitting surface of the lenses of the third lens group is the same as that of the light-emitting surfaces of the lenses of the second lens group, and the height of the third lens group is the same as that of the second lens group. 7. The group control blackboard lamp according to claim 5, characterized in that, the blackboard lamp further comprises: a casing; The light source board group, the LED lamp group, the optical lens group and the power drive assembly are all placed inside the bottom of the housing and inclined toward the blackboard or the wall. 8. The group control blackboard lamp according to claim 7, characterized in that, the housing comprises: a first side and a second side; The height of the first side is higher than that of the second side. 9. The group control blackboard light according to claim 8, characterized in that, the blackboard light further comprises a mounting bracket arranged above the housing. 10. A lighting system, characterized in that it comprises the group-controlled blackboard lights according to any one of claims 1 to 9.