Motion Sensor Types Introduction

Now motion sensor light is more and more popular in the market. And the motion sensor is the key part of it. Knowing what motion sensors really are and how they work will help us choose a proper sensor.

Motion sensor light, is also known as a motion detector. There are a few different types of motion sensor, see the following:

Passive infrared

A passive infrared sensor (PIR sensor) is one of the most common types of motion detectors. This sensor detects body heat AKA infrared radiation. PIR sensors are commonly used in security alarms and automatic lighting applications.



The term “passive” refers to the fact that PIR devices do not radiate energy for detection purposes. They only detecting infrared radiation (radiant heat) emitted by or reflected from objects.


Active infrared

Now that there’s Passive infrared, there should be Active infrared. Now let’s talk about Active Infrared.

Normally an active infrared sensor contains 2 parts. One part emit infrared light and then reflect it onto the other. When someone is between them, the infrared beam is interrupted and trigger the device, normally it might be an alarm.



There’re many laser sensors in Spy movies or Future-tech movies. They work similarly to active infrared sensors but with a visible red beam.(infrared light is invisible) Those sensors are only used in movies to look cool.



Microwave sensors detect motion through the principle of Doppler radar, and are similar to a radar speed gun. The sensor emits and receive the reflection of microwave radiation continuously, if someone is moving the detection area. This change will be capture and triggers the device.

Ultrasonic and tomographic sensors are similar to microwave sensors, but they use high-frequency sound waves and radio waves instead of electromagnetic waves.

Microwave is not sensitive to temperature and could work perfectly between -15°/5F and 60°/140F. But it’s more sensitive to movement of most little things like leaves and might be triggered falsely.


Dual technology 

Dual sensors use 2 different technologies. For example, combination of microwave and passive infrared detection.

Why do we need motion sensor Light


Convenience is important, just imagine that you come back home, the lights on and then off when you enter room. No need to flip any switch in this process. If this sounds good to you, then choose a motion sensor light.

Saving energy.

Saving energy is saving money. No more worry about leaving the lights on. If no one’s around, your home will stay dark.

Home security

Outdoor motion sensor lights (especially floodlights) can deter intruder and warn them to leave. No one wants to do bad thing without the cover of darkness

SOLLA has been a leading flood light and security light provider, we provide many kinds of motion sensor flood light in our web and amazon store. If you’re lucky to read here, use this code MS8%OFF to get a exclusive discount.

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