Parking lamp is either of the two smaller lights attached to the front of a car. Parking is one of the cars set alarm function, when the car parked curbside, on the left side of the parking lights flashing all the time, this feature is mainly used to remind the passing vehicles to avoid scratch during the night. European brand vehicles have this function. Many European laws, such as lateral stop by the road, there is no lights at night must open the outer parking lights, so that in the case of low visibility to other vehicles provide the warning role. Most models operate when the car stops and lights out, and then the turn signal comes to the side where the light is needed, and then the car locks the car. There are also some brands of roadside parking lights with special buttons, such as Mercedes-Benz. The power consumption of parking lights is very low, and it will not cause battery loss for a whole night.
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Classroom lighting design case
The classrooms in the school are a special place for lighting applications, not only paying special attention to the advantages and disadvantages of the light environment (eye safety when students read, glare control when writing on blackboard, etc.), but also energy saving based on the guarantee of lighting quality. A major event.
In this paper, we use radar to control a modified example for energy saving in classrooms, and share and discuss with you how to design an optimal classroom lighting system considering the application of classroom scenes.
In order to let the students learn better, the school classroom will turn on the lights when they are studying in the evening. The principals and teachers certainly hope that the classrooms at night will be filled like this:
But there are also situations like this: the lights are on, the bags are still there, people?
Because students are not satisfied with the classroom during their evening study, they often do not turn off the lights after class, causing the phenomenon of long light. When your school has many classrooms, the wasted electricity is not a small amount.
There is also a very uneven illumination in the classroom when the lights are not turned on during the day, such as this:
Therefore, from the perspective of control, traditional classroom lighting actually has a lot of optimized transformation space, such as the introduction of automatic switching lights in different scenes to achieve the best lighting effect, while saving energy.
The following is a classroom lighting energy-saving renovation plan for a middle school in Tianjin. The design starts with three scenarios:
1. Turn off the lights automatically when no one is used to save electricity;
2. Protect the students' eyesight by intelligent light-filling during the day (when there is natural light on one side of the window and insufficient illumination on the other side);
3. Automatic emergency lighting during power outage to ensure student safety;
Each classroom is equipped with 8 sets of LED lamps + 1 radar light controller + 1 emergency LED tube.
Figure: Lighting layout
The classroom lighting is unified and the front end is connected to a switch with light control and radar sensing function. When the daytime illumination reaches a certain level, the classroom light does not start; when the illumination is low to a certain extent, the classroom lighting starts.
If all students leave the classroom, the controller is delayed for 10 minutes and automatically disconnected to control invalid lighting.
Figure: Light control and radar sensor switch
The radar light control sensor switch has a controllable load of 300W;
The sensing delay time is adjustable from 1 to 15 minutes;
The light control threshold is adjustable from 5 to 100 lx;
In order to prevent the darkness of the classroom caused by sudden power outages, an emergency LED light tube is installed in each classroom. When the power is cut off, the light is turned on to make the students safely evacuate. At the same time, this tube can be unplugged at any time, automatically lit, like a flashlight, you can get outdoor lighting to ensure the safety of evacuation. The power outage emergency time can reach 90 minutes.
Figure: Emergency light tube, can be unplugged at any time to automatically light up as a flashlight.
In order to prevent the controller from being turned off, the switch cannot be turned on. When it bypasses a through switch, when the controller cannot work normally, the through switch is turned on. After the controller is repaired, the control terminal is pulled back.
Figure: classroom lighting wiring
An emergency light tube needs to be connected to a fire line;
In the event of a power outage, the emergency light tube automatically lights up for 90 minutes.
to sum up:
Basically, without changing the original line, a set of healthy, energy-saving and safe classroom lighting renovation solutions can be realized.
Do you have a similar project at hand? Use it!
Finally, in fact, the actual scenes in the classroom must be not only three, but also more scenes, how should we think? Leave a post-reading question, please see the picture below:
In this super-large classroom, if only a few people are sitting, the sensor will also perceive "someone", and turning on all the lights is a bit wasteful. Is there any way to let the sensor know that there are only a few people in the classroom? So you just need to turn on some lights and let them all sit together!
Some students said: It is easy to do, and install a few small-range sensors. Which one is the one that drives the person:
Well, the idea is correct, but think again: If there are only 4 students, they are distributed under 4 sensors? The sensor still thinks that "the classroom is full" and will open the lights of the whole house! 4 people use so many lights, waste å’§~
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