![]() ![]() Motion sensors are often used to turn on outdoor lights when they detect movement in their coverage area. The adjustable timers built into some sensors lets you control how long the attached lights remain active after it detects motion. Devices designed for outdoor use often include a photocell function that turns the system off during the day, which conserves energy. ![]() Many motion sensors use a combination of detection methods to provide enhanced coverage and eliminate false positives. When these warm spots move, it triggers the sensor and any connected electrical circuit. Passive motion sensors detect the infrared energy given off by warm objects such as animals or people. Some of these devices can even sense motion around corners. Movement in the detection area changes the reflected signals and activates the sensor. Active models emit light, radio or ultrasonic sound. The main difference between photocells and motion sensors is that the former detects changing light levels, and the latter reacts to physical movement. Line-voltage, wired photocells control an entire electrical circuit and are an ideal way to manage security or landscape lighting.You’ll need to install one of these devices in each socket for proper operation. Lamp or candelabra base photocells screw into a light bulb socket, turning almost any lamp or permanent fixture into an automatic lighting system.They’re a convenient way to turn a single table or floor lamp on and off. Plug-in photocells work with a standard wall outlet and control a pass-through plug.There are a variety of photocells available today. Other photocell uses include turning on parking-lot or street lights after dark, adjusting indoor dimmers to compensate for changing natural light levels or switching illuminated business signs on or off. Photocells controlling exterior lights combined with timers that turn on interior fixtures create the illusion of occupancy when you’re not home, which can deter intruders. Because they sense ambient light levels, photocells automatically adjust to seasonal changes in the day/night cycle and are unaffected by daylight-saving time. One of the most common uses for photocells is turning exterior lights on at sunset and off at dawn. In some products, the photocell function is adjustable, so you can choose the light level that will activate the semiconductor. Under normal conditions, semiconductors won’t conduct electricity, but when they’re exposed to enough light, current starts to flow. There are several types of photocells available, but they all use the same underlying technology, semiconductors, to control electric current. Explore the differences between photocells and motion sensors and find out how these products, along with dimmers and other controls, can enhance your home’s lighting system. They also save energy by turning themselves off when extra light is unnecessary. These sensors improve the security and safety of your home, automatically turning on lights when it gets dark or they detect motion. Photocells and motion sensors are electronic devices you can use to manage indoor or outdoor lighting. In Dimmers and Controls Info Guides Lighting 101 ![]()
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