How PIR Sensor Switches Work?
There are two basic types of PIR switches:
Active sensor and passive sensor. Active PIR sensors often referred to as radar-based, send out sound waves into the room and wait for the signal to return. (Some garage door openers do the same thing.) If someone enters the room or moves inside the room, the speed of the returning sound waves changes, triggering the PIR switch.
Passive PIR sensors also called passive infrared sensors (PIR) or pyroelectric detectors, detect body heat from humans and animals. The sensor uses a photodetector, which converts light in the wavelengths into electrical current that triggers an alarm in the minicomputer housed in the detector, activating the PIR switch. To prevent nuisance switching, the computer ignores slow changes in room temperature due to sunlight.
1.May I have a sample order ?
Yes, sample order is available.
2. What about the lead time?
The lead time of sample is 5-7 days, the delivery time of order is 7-45 days.
3. Do you have any MOQ limit for order?
Yes, the MOQ limit is according to different product.
4. How do you ship the goods and how long does it take to arrive?
We usually ship by DHL, UPS, FedEx or TNT. It usually takes 3-5 days to arrive. Airline and sea shipping is optional.
5. How to proceed an order?
Firstly let us know your requirements or application.
Secondly We quote according to your requirements or our suggestions.
Thirdly customer confirms the samples and places deposit for formal order.
Fourthly We arrange the production.
6.What’s the payment mothed?
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Definition and Types of Spot Light1. Definition
A spot light is a kind of lamp that uses a reflector or a condenser lens to make a visible light. The spot light is a relatively simple point light type lamp. Its illumination intensity is relatively high, and the illumination range is relatively narrow. Its light source is a neutral light source. We often use spot lights in some studios, indoor studios or some relatively large shopping malls, shops, etc. Among these many spot lights, the most popular one is the LED spot light.
There are three types of spot lights.
(1)Contour Spot Light (Modeling Spot Light)
The structure of this spot light can focus the light around the projection surface strongly, and it is an indispensable light fixture for tracking performers.This lamp is different from other spotlights. It has two lenses, a light that can change the size of the projection area, and a light-cutting plate that can change the shape of the projection.
(2)Soft Spot Light
The light profile of this lamp is soft, and it can also make the performer relax. It is usually used in Fresnel lens spot lights.
(3)Plano-Convex Spot Light
Its light is soft but strong. Although the outline is clear, it is not focused light like a contour spot light, so it is more difficult to express it from the quality of the light. Therefore, it is generally called a Plano-Convex spotlight according to its structure. It has become the main lighting equipment for stage lighting, and it is also indispensable on the stage.
The Function of Spot Light
The advantages of spot lights are light weight and small size, uniform spot distribution, and large spot adjustment range. When shooting, it is mostly used for large-area lighting and special lighting in special effects shooting, as well as lighting for characters and scenery. The role of LED spot lights is actually diverse. Since the color temperature, spot and illuminance of LED spot lights are all controllable, it can meet the requirements of users in a variety of occasions and environments.
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