What Is a Motion Sensor Light?
A motion sensor light is a light fixture that turns on when its sensor detects movement nearby. The sensor controls the lamp without a person needing to flip a switch. These lights are often used outdoors to light an entry, driveway or other area when someone approaches.
Quick Facts About Motion Sensor Light
- Category
- Sensor-controlled lighting
- Used for
- Automatic area lighting
- Common confusion
- Dusk-to-dawn lighting
- Also called
- Motion Activated Light, Motion-activated light
- Often discussed with
- Security Lighting Installation, Outdoor Lighting Installation
Key Takeaways About Motion Sensor Light
- Sensor coverage depends on placement and direction.
- Some models let you adjust their settings.
- Motion sensing and dusk-to-dawn control aren't the same.
How Motion Sensor Light Works
A motion sensor light uses a sensor to watch an area. A common type uses passive infrared sensing to detect changes in heat as a person or animal moves. The sensor sends a signal to the lamp when it detects that change. Related service: Security Lighting Installation.
Related glossary terms: Branch Circuit, Electrical Load, Landscape Lighting Transformer.
The sensor has a detection area shaped by its design and direction. A wall, tree or other object can block part of that area. Movement outside the sensor's view won't trigger the lamp.
Many models have controls for the detection area and how long the lamp stays lit. Some also have a daylight setting that keeps the lamp off when the area is bright. Available controls depend on the fixture, so your model may have different options.
From the GMB Electric team
When we install security lighting, we look at where people approach the area. We also check where the sensor points and whether nearby objects block its view. That helps us place the fixture where its detection area fits the space.
Motion Sensor Light in Practice: A Real-World Example
An Indianapolis homeowner wants security lighting near a side door. A motion sensor light aimed toward the path turns the lamp on as someone approaches.
Related Terms
Branch Circuit
A branch circuit is a section of electrical wiring that carries power from a circuit breaker or fuse to outlets, lights, or equipment.
Electrical Load
An electrical load is the demand placed on an electrical system by equipment that uses power.
Landscape Lighting Transformer
A landscape lighting transformer is an electrical device that reduces household voltage for low-voltage outdoor lights.
GMB Electric
Have Questions About Motion Sensor Light?
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