Lutron is a well-known US-based manufacturer of light control products which are available world-wide and, since it has more than 50 years of experience into building industrial and home-based lighting systems, I did choose the Lutron Maestro sensor light switch, model MS-OPS2 as the main representative of the IR motion sensor light switches and, by taking into account that this is such a renowned brand, I do expect to see a robust and reliable device, despite it not featuring the better dual-technology (it lacks the ultrasonic sensor). Lutron Maestro Sensor Light Switch MS-OPS2 That being said, regardless of the used technology, these devices can help you save money on your electricity bill and can prove to be a welcomed addition in a home where kids often forget to turn off the lights (or in rooms that you often enter with your hands full), so let’s see which can be considered the best traditional motion sensor light switches, as well as the better devices that can be a part of an IoT environment. Since we are in 2021 and the smart home is no longer a dream, some light switches have also gained the smart attribute by allowing the users to connect their light switches either directly to a mobile device or to a smart hub using the WiFi connection, so they can remotely turn on or off the lights inside their home. The manufacturers can also use temperature sensors, audio detectors, microwave sensors or humidity sensors to detect the presence of humans, but the most common are the PIR and the ultrasonic sensors – to get the most reliable motion sensor light switch, it is better to use both (for smaller and more significant movement detection). TopGreener TSOS5 Motion Sensor Light Switch Leviton Decora OSSMD-GDW Smart Light Switch UPDATE : The TopGreener TSOS5 has been added to the best motion sensor light switch list. In order to properly detect the presence of a human being inside a room, the occupancy (motion) sensor can take advantage of several types of technologies: it can be a pyroelectric sensor which measures the infrared radiation (PIR – Passive InfraRed) and, since everything emits a certain level of IR radiation, it is quite easy to detect major fluctuations emitted when a person passes by (the disadvantage is that the sensor will detect only significant movements and only in direct line of sight) the second major type of occupancy sensors can use the ultrasonic technology in order to detect smaller changes into the environment (so the light doesn’t turn off when you’re reading a book or typing on the computer keyboard) – to accomplish it, the sensor sends a small pulse into the room, which returns and allows the device to detect any changes (the disadvantage is that it can be prone to false detection and it draws more power). I’m sure you have encountered at least one motion sensor light in a public bathroom or in a hotel, but, as these devices became more reliable (and more affordable), they are now quite widespread in homes as well. This type of approach has been around for more than a decade and it has proven to be very useful in many applications. A motion sensor light switch differs from the traditional light switch in both design and functionality, but most importantly, the most fundamental distinction between them is the use of a motion sensor to detect movement and to automatically turn on the light in a specific area.
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