A gray field night lighting system and control method thereof

Abstract

The present invention provides a nighttime lighting system for an ash field and a control method thereof, and relates to the field of ash field lighting. The nighttime lighting system for an ash field includes an ash field and a lighting device. A roadside ash dam is provided on the side of the ash field close to the access road. The lighting device is arranged on the roadside ash dam. The lighting device includes at least two searchlights arranged at intervals along the length direction of the roadside ash dam. The ash field includes a high-beam area away from the roadside ash dam and a low-beam area close to the roadside ash dam. At least two searchlights are high-beam and low-beam adjustable lamps. The searchlights have a high-beam mode, a medium-beam mode, and a low-beam mode. At least two searchlights are high-beam mode to illuminate the high-beam area. At least two searchlights are low-beam mode, or one of the searchlights is low-beam mode and the other searchlights are medium-beam mode to illuminate the low-beam area. By using different working mode combinations of at least two searchlights, a better nighttime lighting effect can be achieved for the entire ash field.

Description

Technical Field

[0001] The present invention relates to the technical field of gray field lighting, and in particular to a gray field nighttime lighting system and a control method thereof. Background Art

[0002] In thermal power plants, an ash yard (also referred to as an "ash yard") is usually set up as a storage site for the ash produced by coal-fired power generation units. If you choose to transport the ash by car at night, you need to use the lighting system in the yard, otherwise it will affect the transportation operation.

[0003] At present, the ash field is formed by surrounding the ash dam on all sides. Due to the large area of ​​the ash field, the hardened road leading to the ash field is only laid outside the ash field, and there is only a simple road inside the ash field after the ash slag is compacted. It is impossible to arrange lighting points in the ash field, and it is even more difficult to lay power supply lines. Figure 1 As shown, a high-power floodlight d is usually installed on a street lamp on one side of the ash dam b near the ash field a; or Figure 2 As shown, a plurality of floodlights d are arranged on the top of the ash dam b on the side close to the access road c.

[0004] However, the above two lighting arrangement schemes require a large number of floodlights, which are difficult to install and have high electricity costs. Moreover, multiple floodlights can only effectively illuminate one side of the ash field, and the nighttime lighting effect of the entire ash field is poor. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a ash field nighttime lighting system and a control method thereof, so as to solve the problem that the existing ash field lighting scheme requires a large number of floodlights, is difficult to install, and has high electricity costs; moreover, multiple floodlights can only effectively illuminate one side area within the ash field, and the nighttime lighting effect of the entire ash field is poor.

[0006] The technical solution of the gray field nighttime lighting system of the present invention is:

[0007] The nighttime lighting system of the ash field comprises an ash field and a lighting device. The ash field is provided with a roadside ash dam on one side close to the access road. The lighting device is arranged on the roadside ash dam. The lighting device comprises at least two searchlights arranged at intervals along the length direction of the roadside ash dam.

[0008] The ash field includes a high beam area far away from the roadside ash dam and a low beam area close to the roadside ash dam, at least two of the searchlights are high and low beam adjustable lamps, and the searchlights have a high beam mode, a medium beam mode and a low beam mode;

[0009] At least two of the searchlights are in high beam mode to illuminate the high beam area; at least two of the searchlights are in low beam mode, or one of the searchlights is in low beam mode and the other searchlights are in medium beam mode to illuminate the low beam area.

[0010] Furthermore, the searchlights are provided with two, namely a first searchlight and a second searchlight, the low beam area includes a first low beam area and a second low beam area, the first low beam area is distributed corresponding to one side of the first searchlight, and the second low beam area is distributed corresponding to one side of the second searchlight;

[0011] The first searchlight is in low beam mode and the second searchlight is in medium beam mode to illuminate the first low beam area; the first searchlight is in medium beam mode and the second searchlight is in low beam mode to illuminate the second low beam area.

[0012] Furthermore, the low beam area also includes a middle low beam area, and the middle low beam area corresponds to the interval position distribution of the first searchlight and the second searchlight, and the first searchlight and the second searchlight are both in low beam mode to illuminate the middle low beam area.

[0013] Furthermore, the gray field also includes a medium light area between the high light area and the low light area, and both of the two searchlights are in medium light mode, or one of the searchlights is in medium light mode and the other searchlight is in high light mode to illuminate the medium light area.

[0014] Furthermore, the searchlights are provided with two, namely a first searchlight and a second searchlight, the middle light area includes a first middle light area and a second middle light area, the first middle light area is distributed corresponding to one side of the first searchlight, and the second middle light area is distributed corresponding to one side of the second searchlight;

[0015] The first searchlight is in medium beam mode and the second searchlight is in high beam mode to illuminate the first medium beam area; the first searchlight is in high beam mode and the second searchlight is in medium beam mode to illuminate the second medium beam area;

[0016] The medium light area also includes a central medium light area, which corresponds to the interval position distribution of the first searchlight and the second searchlight. The first searchlight and the second searchlight are both in medium light mode to illuminate the central medium light area.

[0017] The technical solution of the control method of the gray field nighttime lighting system of the present invention is:

[0018] The control method of the gray field night lighting system includes the following steps:

[0019] Step 1: defining an area in the ash field far from the roadside ash dam as a high-beam area, and defining an area in the ash field close to the roadside ash dam as a low-beam area;

[0020] Step 2: If the operation is performed in the high beam area of ​​the gray field, at least two of the searchlights are controlled to be in high beam mode to illuminate the high beam area;

[0021] Step three: if operating in the low beam area of ​​the gray field, control at least two of the searchlights to be in low beam mode, or, one of the searchlights to be in low beam mode and the other searchlights to be in medium beam mode, so as to illuminate the low beam area.

[0022] Furthermore, the searchlights are provided with two, namely a first searchlight and a second searchlight, and a side area of ​​the low beam area corresponding to the first searchlight is defined as a first low beam area, and a side area of ​​the low beam area corresponding to the second searchlight is defined as a second low beam area;

[0023] In step three, if operating in the first low beam area, the first searchlight is controlled to be in low beam mode and the second searchlight is controlled to be in medium beam mode to illuminate the first low beam area; if operating in the second low beam area, the first searchlight is controlled to be in medium beam mode and the second searchlight is controlled to be in low beam mode to illuminate the second low beam area.

[0024] Furthermore, the area of ​​the low beam area corresponding to the interval between the first searchlight and the second searchlight is designated as a middle low beam area. When operating in the middle low beam area, the first searchlight and the second searchlight are both controlled to be in low beam mode to illuminate the middle low beam area.

[0025] Further, the area between the high beam area and the low beam area in the gray field is defined as a medium beam area, and the searchlight is provided with two, which are a first searchlight and a second searchlight; and further comprising step 4, defining a side area of ​​the medium beam area corresponding to the first searchlight as a first medium beam area, and defining a side area of ​​the medium beam area corresponding to the second searchlight as a second medium beam area;

[0026] In step four, if working in the first medium light area, the first searchlight is controlled to the medium light mode and the second searchlight is controlled to the high beam mode to illuminate the first medium light area; if working in the second medium light area, the first searchlight is controlled to the high beam mode and the second searchlight is controlled to the medium light mode to illuminate the second medium light area.

[0027] Furthermore, the area of ​​the medium light area corresponding to the interval between the first searchlight and the second searchlight is designated as a middle medium light area. When operating in the middle medium light area, the first searchlight and the second searchlight are both controlled to be in medium light mode to illuminate the middle medium light area.

[0028] Beneficial effects: The ash yard night lighting system adopts at least two searchlights arranged at intervals on the roadside ash dam on the side of the ash yard close to the access road, wherein at least two searchlights are high and low beam adjustable lamps. The searchlights can provide long-range lighting coverage when in high beam mode, medium-range lighting coverage when in medium light mode, and short-range lighting coverage when in low beam mode. The use of high and low beam adjustable searchlights to replace the ash yard lighting solutions in the prior art avoids the need to arrange a large number of floodlights and lay power supply lines over long distances, has low installation difficulty, and lower electricity costs.

[0029] More importantly, when working in the high-beam area far away from the roadside ash dam, at least two searchlights are in high-beam mode, and the best lighting effect is achieved in the high-beam area after the lighting is superimposed; when working in the low-beam area close to the roadside ash dam, at least two searchlights are in low-beam mode, or one searchlight is in low-beam mode and the other searchlights are in medium-beam mode, and the best lighting effect is achieved in the low-beam area after the lighting is superimposed. Multiple floodlights in the prior art can only effectively illuminate one side of the ash field, but by using at least two searchlights in different working mode combinations, a better nighttime lighting effect can be achieved for the entire ash field. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the arrangement of the gray field lighting scheme 1 in the prior art in the background technology;

[0031] Figure 2 It is a schematic diagram of the arrangement of the gray field lighting scheme 2 in the prior art in the background technology;

[0032] Figure 3 A schematic diagram of the division of the gray field area in a specific embodiment of the gray field nighttime lighting system of the present invention;

[0033] Figure 4 A schematic diagram of the operation of the gray field nighttime lighting system in a specific embodiment of the gray field nighttime lighting system of the present invention.

[0034] Figure 1 , Figure 2 Middle: a-ash field, b-ash dam, c-access road, d-floodlight;

[0035] Figure 3 , Figure 4Middle: 1-ash field, 10-roadside ash dam, 11-low beam area, 12-medium beam area, 13-high beam area, X1-first low beam area, Y1-middle low beam area, Z1-second low beam area, X2-first medium beam area, Y2-middle medium beam area, Z2-second medium beam area, 2-approach road, 20-approach street light, 3-searchlight, 31-first searchlight, 32-second searchlight. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] A specific embodiment 1 of the gray field nighttime lighting system of the present invention is as follows: Figure 3 , Figure 4 As shown, the nighttime lighting system of the ash yard includes an ash yard 1 and a lighting device. A roadside ash dam 10 is provided on the side of the ash yard 1 close to the access road 2. The lighting device is arranged on the roadside ash dam 10. The lighting device includes at least two searchlights 3 arranged at intervals along the length direction of the roadside ash dam 10. The ash yard 1 includes a high-beam area 13 away from the roadside ash dam 10 and a low-beam area 11 close to the roadside ash dam 10. At least two searchlights 3 are adjustable high and low beam lamps, and the searchlights 3 have a high-beam mode, a medium-beam mode and a low-beam mode. At least two searchlights 3 are in the high-beam mode to illuminate the high-beam area 13. At least two searchlights 3 are in the low-beam mode, or one of the searchlights 3 is in the low-beam mode and the other searchlights are in the medium-beam mode to illuminate the low-beam area 11.

[0038] The ash yard night lighting system adopts at least two searchlights 3 arranged at intervals on the roadside ash dam 10 on the side of the ash yard 1 close to the access road 2, wherein at least two searchlights 3 are adjustable high and low beam lamps, and the searchlights 3 can provide long-range lighting coverage when in high beam mode, can provide medium-range lighting coverage when in medium beam mode, and can provide short-range lighting coverage when in low beam mode; using the searchlights with adjustable high and low beams to replace the ash yard lighting solutions in the prior art avoids the need to arrange a large number of floodlights and lay power supply lines over long distances, has low installation difficulty, and lower electricity costs.

[0039] More importantly, when operating in the high beam area 13 far from the roadside ash dam 10, at least two searchlights 3 are in high beam mode, and the best lighting effect is achieved for the high beam area 13 after superposition of lighting; when operating in the low beam area 11 close to the roadside ash dam 10, at least two searchlights 3 are in low beam mode, or one of the searchlights 3 is in low beam mode and the other searchlights are in medium beam mode, and the best lighting effect is achieved for the low beam area 11 after superposition of lighting. The multiple floodlights in the prior art can only effectively illuminate one side of the ash field 1, but by using at least two searchlights 3 in different working mode combinations, a better nighttime lighting effect can be achieved for the entire ash field.

[0040] In this embodiment, there are two searchlights 3, namely the first searchlight 31 and the second searchlight 32. Both of them are xenon searchlights with adjustable beams. The coverage of the beam is controlled by adjusting the angle of the internal reflector, so as to select a suitable illumination beam according to the distance of the working area. The low beam area 11 includes a first low beam area X1 and a second low beam area Z1. The first low beam area X1 corresponds to one side of the first searchlight 31, and the second low beam area Z1 corresponds to one side of the second searchlight 32; the first searchlight 31 is in low beam mode and the second searchlight 32 is in medium beam mode to illuminate the first low beam area X1; the first searchlight 31 is in medium beam mode and the second searchlight 32 is in low beam mode to illuminate the second low beam area Z1.

[0041] Specifically, the first searchlight 31 is arranged on the left side of the roadside ash dam 10, and the second searchlight 32 is arranged on the right side of the roadside ash dam 10, that is, the left part of the low beam area 11 is the first low beam area X1, and the right part of the low beam area 11 is the second low beam area Z1. When operating in the first low beam area X1, the first low beam area X1 corresponds to one side of the first searchlight 31, and the first searchlight 31 uses the low beam mode for short-range lighting coverage. The first low beam area X1 is far away from the second searchlight 32, and the second searchlight 32 uses the medium beam mode for medium-range lighting coverage. The first searchlight 31 and the second searchlight 32 are superimposed to achieve the best lighting effect.

[0042] The low beam area 11 also includes a middle low beam area Y1, which corresponds to the interval position distribution of the first searchlight 31 and the second searchlight 32. The first searchlight 31 and the second searchlight 32 are both low beam mode to illuminate the middle low beam area Y1. When working in the middle low beam area Y1, approach the first searchlight 31 and the second searchlight 32 respectively, and both searchlights 3 use low beam mode, and the best lighting effect is achieved through the short-range lighting coverage and superposition of the two.

[0043] In this embodiment, the gray field 1 also includes a medium light area 12 between the far light area 13 and the low light area 11, and both searchlights 3 are in medium light mode, or one of the searchlights 3 is in medium light mode and the other searchlights 3 are in far light mode, so as to illuminate the medium light area 12. In addition, the medium light area 12 includes a first medium light area X2 and a second medium light area Z2, the first medium light area X2 is distributed corresponding to one side of the first searchlight 31, and the second medium light area Z2 is distributed corresponding to one side of the second searchlight 32; the first searchlight 31 is in medium light mode and the second searchlight 32 is in far light mode, so as to illuminate the first medium light area X2; the first searchlight 31 is in far light mode and the second searchlight 32 is in medium light mode, so as to illuminate the second medium light area Z2.

[0044] That is, the left part of the medium light area 12 is the first medium light area X2, and the right part of the medium light area 12 is the second medium light area Z2. When operating in the first medium light area X2, the first medium light area X2 corresponds to one side of the first searchlight 31, and the first searchlight 31 uses the medium light mode for medium-range lighting coverage. The first medium light area X2 is far away from the second searchlight 32, and the second searchlight 32 uses the high light mode for long-range lighting coverage. The first searchlight 31 and the second searchlight 32 are superimposed to achieve the best lighting effect. Correspondingly, when operating in the second medium light area Z2, the first searchlight 31 uses the high light mode for long-range lighting coverage, and the second searchlight 32 uses the medium light mode for medium-range lighting coverage.

[0045] Among them, the medium light area 12 also includes a middle medium light area Y2, and the middle medium light area Y2 corresponds to the interval position distribution of the first searchlight 31 and the second searchlight 32. The first searchlight 31 and the second searchlight 32 are both in medium light mode to illuminate the middle medium light area Y2. When working in the middle medium light area Y2, the distance from the first searchlight 31 and the second searchlight 32 is relatively far, and the two searchlights 3 both use the medium light mode, and the best lighting effect is achieved through the mid-range lighting coverage of the two and after superposition. The specific scheme of the gray field night lighting system is shown in Table 1 (light ① represents the first searchlight, and light ② represents the second searchlight):

[0046]

[0047]

[0048] Table 1

[0049] It should be noted that the gray field 1 is in the shape of a square, the low beam area 11, the medium beam area 12 and the high beam area 13 are distributed in parallel in strips, the first low beam area X1, the middle low beam area Y1 and the second low beam area Z1, as well as the first medium beam area X2, the middle medium beam area Y2 and the second medium beam area Z2 are distributed in a grid shape, and the grid-shaped partition is convenient for controlling the working mode of the lighting system, which is more in line with the actual gray field operation situation. Since the high beam area 13 is far away from the two searchlights 3, the two searchlights 3 both use the high beam mode for long-distance lighting to achieve the best lighting effect, and the medium beam area 12 is at least far away from one searchlight 3, and the low beam area 11 is at least close to one searchlight 3. The best lighting effect is achieved by combining different lighting modes and superimposing them.

[0050] The control method of the gray field nighttime lighting system comprises the following steps:

[0051] Step 1: the area in the ash field 1 far from the roadside ash dam 10 is defined as the high-beam area 13, and the area in the ash field 1 close to the roadside ash dam 10 is defined as the low-beam area 11;

[0052] Step 2: If the operation is performed in the high beam area 13 of the ash field 1, at least two searchlights 3 are controlled to be in high beam mode to illuminate the high beam area 13;

[0053] Step 3: when operating in the low beam area 11 of the gray field 1 , control at least two searchlights 3 to be in low beam mode, or control one searchlight 3 to be in low beam mode and the other searchlights 3 to be in medium beam mode, so as to illuminate the low beam area 11 .

[0054] Specifically, there are two searchlights 3, namely a first searchlight 31 and a second searchlight 32. A side area of ​​the low beam area 11 corresponding to the first searchlight 31 is defined as a first low beam area X1, and a side area of ​​the low beam area 11 corresponding to the second searchlight 32 is defined as a second low beam area Z1.

[0055] In step three, if operating in the first low beam area X1, the first searchlight 31 is controlled to be in low beam mode and the second searchlight 32 is controlled to be in medium beam mode to illuminate the first low beam area X1; if operating in the second low beam area Z1, the first searchlight 31 is controlled to be in medium beam mode and the second searchlight 32 is controlled to be in low beam mode to illuminate the second low beam area Z1; the area of ​​the low beam area 11 corresponding to the interval between the first searchlight 31 and the second searchlight 32 is designated as the middle low beam area Y1. If operating in the middle low beam area Y1, the first searchlight 31 and the second searchlight 32 are both controlled to be in low beam mode to illuminate the middle low beam area Y1.

[0056] The area between the high beam area 13 and the low beam area 11 in the gray field 1 is defined as the medium beam area 12; the control method of the gray field nighttime lighting system also includes step 4, defining a side area of ​​the medium beam area 12 corresponding to the first searchlight 31 as a first medium beam area X2, and defining a side area of ​​the medium beam area 12 corresponding to the second searchlight 32 as a second medium beam area Z2;

[0057] In step four, if the operation is in the first medium light area X2, the first searchlight 31 is controlled to the medium light mode and the second searchlight 32 is controlled to the high beam mode to illuminate the first medium light area X2; if the operation is in the second medium light area Z2, the first searchlight 31 is controlled to the high beam mode and the second searchlight 32 is controlled to the medium light mode to illuminate the second medium light area Z2.

[0058] The area of ​​the medium light area 12 corresponding to the interval between the first searchlight 31 and the second searchlight 32 is defined as the middle medium light area Y2. When working in the middle medium light area Y2, the first searchlight 31 and the second searchlight 32 are both controlled to be in the medium light mode to illuminate the middle medium light area Y2. By controlling the gray field nighttime lighting system according to the above method, the best lighting effect can be achieved by combining and superimposing different lighting modes.

[0059] The specific embodiment of the control method of the gray field nighttime lighting system of the present invention is the same as the specific embodiment of the control method of the gray field nighttime lighting system in the specific implementation mode of the gray field nighttime lighting system of the present invention, and will not be repeated here.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A gray field night lighting system, characterized in that: It comprises an ash field and a lighting device, wherein the ash field is provided with a roadside ash dam on one side close to the access road, the lighting device is arranged on the roadside ash dam, and the lighting device comprises at least two searchlights arranged at intervals along the length direction of the roadside ash dam; The ash field includes a high beam area far away from the roadside ash dam and a low beam area close to the roadside ash dam, at least two of the searchlights are high and low beam adjustable lamps, and the searchlights have a high beam mode, a medium beam mode and a low beam mode; At least two of the searchlights are in high beam mode to illuminate the high beam area; at least two of the searchlights are in low beam mode, or one of the searchlights is in low beam mode and the other searchlights are in medium beam mode to illuminate the low beam area; The searchlights are provided with two, which are respectively a first searchlight and a second searchlight, and the low beam area includes a first low beam area and a second low beam area, the first low beam area is distributed corresponding to one side of the first searchlight, and the second low beam area is distributed corresponding to one side of the second searchlight; The first searchlight is in low beam mode and the second searchlight is in medium beam mode, so as to illuminate the first low beam area; the first searchlight is in medium beam mode and the second searchlight is in low beam mode, so as to illuminate the second low beam area; The gray field also includes a medium light area between the high light area and the low light area, and both of the two searchlights are in medium light mode, or one of the searchlights is in medium light mode and the other searchlight is in high light mode to illuminate the medium light area.

2. The gray field nighttime lighting system according to claim 1 is characterized in that: The low beam area also includes a middle low beam area, and the middle low beam area corresponds to the interval position distribution of the first searchlight and the second searchlight. The first searchlight and the second searchlight are both in low beam mode to illuminate the middle low beam area.

3. The gray field nighttime lighting system according to claim 1 is characterized in that: The middle light area includes a first middle light area and a second middle light area, the first middle light area is distributed corresponding to one side of the first searchlight, and the second middle light area is distributed corresponding to one side of the second searchlight; The first searchlight is in medium beam mode and the second searchlight is in high beam mode to illuminate the first medium beam area; the first searchlight is in high beam mode and the second searchlight is in medium beam mode to illuminate the second medium beam area; The medium light area also includes a central medium light area, which corresponds to the interval position distribution of the first searchlight and the second searchlight. The first searchlight and the second searchlight are both in medium light mode to illuminate the central medium light area.

4. A control method for a gray field nighttime lighting system, applied to the gray field nighttime lighting system of claim 1, characterized in that: The following steps are involved: Step 1: defining an area in the ash field far from the roadside ash dam as a high-beam area, and defining an area in the ash field close to the roadside ash dam as a low-beam area; Step 2: If the operation is performed in the high beam area of ​​the gray field, at least two of the searchlights are controlled to be in high beam mode to illuminate the high beam area; Step three: if operating in the low beam area of ​​the gray field, control at least two of the searchlights to be in low beam mode, or, one of the searchlights to be in low beam mode and the other searchlights to be in medium beam mode, so as to illuminate the low beam area.

5. The control method of the gray field nighttime lighting system according to claim 4 is characterized in that: The searchlights are provided with two, namely a first searchlight and a second searchlight, and a side area of ​​the low beam area corresponding to the first searchlight is defined as a first low beam area, and a side area of ​​the low beam area corresponding to the second searchlight is defined as a second low beam area; In step 3, if the first low beam area is used, the first searchlight is controlled to be in low beam mode and the second searchlight is controlled to be in medium beam mode to illuminate the first low beam area; If operating in the second low-beam area, the first searchlight is controlled to be in the medium-beam mode and the second searchlight is controlled to be in the low-beam mode to illuminate the second low-beam area.

6. The control method of the gray field nighttime lighting system according to claim 5 is characterized in that: The area of ​​the low beam area corresponding to the interval between the first searchlight and the second searchlight is defined as a middle low beam area. When operating in the middle low beam area, the first searchlight and the second searchlight are both controlled to be in low beam mode to illuminate the middle low beam area.

7. The control method of the gray field nighttime lighting system according to claim 4 is characterized in that: The area between the high beam area and the low beam area in the gray field is defined as a medium beam area, and the searchlight is provided with two, namely a first searchlight and a second searchlight; and further comprising step 4, defining a side area of ​​the medium beam area corresponding to the first searchlight as a first medium beam area, and defining a side area of ​​the medium beam area corresponding to the second searchlight as a second medium beam area; In step 4, if the operation is performed in the first medium light area, the first searchlight is controlled to be in medium light mode and the second searchlight is controlled to be in high light mode to illuminate the first medium light area; If working in the second medium light area, the first searchlight is controlled to be in the high beam mode and the second searchlight is controlled to be in the medium beam mode to illuminate the second medium light area.

8. The control method of the gray field nighttime lighting system according to claim 7 is characterized in that: The area of ​​the medium light area corresponding to the interval between the first searchlight and the second searchlight is defined as the middle medium light area. When operating in the middle medium light area, the first searchlight and the second searchlight are controlled to be in medium light mode to illuminate the middle medium light area.

Images