Whether in offices, homes, or public areas, motion sensor lights are undoubtedly one of the best lighting solutions that perfectly combine illumination, automation, and energy-saving all in one. When working in a large open office with many colleagues, motion sensor lights help shut the lights off after they all have left the office, so we don’t ever have to worry about when or whether to turn off the lights again. If the lights are accidentally left on all night without turning off, it could consume a massive amount of electricity that increases your bills by a lot. Commercial electricity is relatively expensive, and you don’t want to waste it.
Though motion sensor lights help form a no-touch lighting experience, sometimes it can cause minor trouble when it’s not properly adjusted. One of the common problems is that a motion sensor light might turn off while we are still working in the office, especially when it’s a large one and with few people, and the motion sensor might “think” the room is already vacant with no valid motion detected. In this case, you might have to frequently stand up and wave your hands to let the motion sensor “see” you again to turn the light on once again.
The frequent turning-offs are not a big problem for outdoor lights as they are mainly used for security detection to spot suspicious activities and light up the dark. But for indoor motion-activated based lighting, whether you are using a motion sensor wall switch or a ceiling occupancy sensor, the frequent turn-offs can be a big problem that greatly affects our life & working schedules and efficiency.
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The most direct reason for a motion sensor light turning off is that it is no longer detecting any motion within its sensor zone. If the motion sensor light can turn on just fine when you are in the room, it means the motion sensor is functioning well and not being faulty. So we can exclude the cause of a damaged motion sensor and narrow our troubleshooting process.
With a normal, functioning motion sensor, when it turns off too soon, it’s usually because of the unprofessional installation or improper adjustment that makes the motion sensor not at its full potential to detect motion effectively.
The location, position, and placement of motion sensor lights is an art and should be carefully planned before installation. You need to carefully calculate the overall detection coverage, height of the motion sensor’s position, and all obstacles in the room, such as stalls and desks, which can block the PIR motion sensor from successfully receiving signals and take them all into account.
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A PIR motion sensor needs to be able to directly “see” you to identify whether you are there. Without a professional installation, an indoor motion sensor light led by either an occupancy sensor or a motion sensor wall switch can turn off unexpectedly.
Motion sensor lights are customizable so they can be tailor programmed and fit in various situations. There is no best one-fit-all setting. Users should test and find out the optimal motion sensor setting to suit their demands. The same motion sensor light might be used in a large room, small room, or even corridors that people simply pass by, and different time and sensitivity settings should be applied in such scenarios.
Whether you are using an indoor motion sensor night light, strip light, outdoor motion sensor floodlight, occupancy sensor controlled light or a motion-activated light switch, the adjustment of the motion sensors are almost identical and can apply to all these motion sensor lights.
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Some motion sensors are built-in inside the light fixture, such as motion sensor switches, while some motion sensor lights consist of an individual motion sensor and a separate light. Readers can choose the methods working for your specific motion sensor light, depending on your own judgment.
The sensitivity setting on a motion sensor light defines how far a motion sensor can detect and how sensitive to minor and small motions. The ability for the motion sensor to detect small motions is smaller than the overall detection range. Since the sensor sensitivity setting also defines how far the motion sensor detects, the “sensitivity” is also seen and called “range” in other models.
When testing a motion sensor’s detecting area by large motions like walking like we always do, it does not mean the motion sensor can still detect you at the same distance while you are sitting there working, reading, and typing. It’s recommended to test the distance and sensitivity using the same scenarios to get a consistent performance of how the motion sensor light reacts to your movement.
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If your motion sensor light’s previous sensitivity level is set to low or medium, the first and easiest step we try is to set the sensitivity to high. Now the motion sensor light can detect motion from a longer distance, and is also able to detect some of the minor movement that it was not able to pick up when on low and medium sensitivity settings.
The time delay setting is a count-down timer that remains a motion sensor light to stay on after it cannot detect any motion, in other words, it delays the light from turning off. For example, a 15-minute time delay will keep the motion sensor light on for an extra 15 minutes after the room is empty, then shut off the light. If you come back to the room within 15 minutes after you leave, the light keeps on and will reset the count-down timer of the time delay. The next time the room is vacant, the motion sensor will start to count down from 15 minutes again until the light is finally turned off.
People might ask, why should a motion sensor light keep on when the room is empty with no people? Shouldn’t it turn off immediately? Well, at first glance, it seems the time delay is against the design purpose of maximum energy-saving. Still, a reasonable time delay is necessary to prevent more inconvenience from happening.
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One most significant reason for setting a time delay is to keep the light consistent and stop the light from suddenly turning off.
For places with people often in and out, such as open offices, a small to medium time delay such as 5 mins to 15 mins works the best. With many people walking by, the motion sensor is always triggered, thus keeping the light on. But when there are not so many people in the room, such as a few staff working overtime at night, a low time delay may not be enough to detect motion as efficiently as in the daytime with fewer people triggering the motion sensor.
Setting a higher time delay value could mostly solve your problem in such scenarios. Most motion sensors, especially indoor motion sensor lights and wall switches, make time delay very easy to change because the time delay is usually the most frequently used and adjusted setting compared to other setting such as light sensor or sensor mode, which is set and forget.
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Though there are many types of motion sensors used for detecting motion, such as passive infrared motion sensors, ultrasonic motion sensors, and microwave motion sensors, most motion sensor lights utilize PIR motion sensors as the motion detector for the following reasons.
The reason why PIR(passive infrared) motion sensors are widely used is that they work passively by receiving heat signals emitted by warm bodies, which only requires very little power consumption, whereas active motion sensors like ultrasonic and microwave sensors need to actively send out and receive sound and microwave signals to detect motion which might use a lot of energy. PIR motion sensors are favored for their durability, stability, reacting only to heat but movement, small in size, cheap cost and their biggest advantage for being energy-efficient which is fantastic to be used to align with lights.
But PIR motion sensors do have their downside, which might cause the light to turn off unwantedly. Unlike ultrasonic and microwave signals that can pass and detect motion around corners and obstacles, PIR motion sensors need to “see” the emitted infrared beam, and the IR cannot move past corners. In this case, PIR motion sensors cannot detect motion behind the obstacles like stalls, walls, or around corners.
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With that said above, one possible reason a motion sensor light keeps turning off is that it does not have a clear sight of view of the sensing area, which might cause it to only be able to detect motion intermittently, and ends up turning the light off every now and then.
What we can do to stop the motion sensor light from turning off is to re-adjust and reposition the motion sensor to make the lens(motion sensor detection window) faces straight to the wanted detecting area with no other obstacles blocking its sight of view.
If you are using a motion sensor light switch fit into a wall box that cannot be easily adjusted and relocated, you can consider adding more motion sensor switches at other sides of the room or mounting a ceiling mount occupancy sensor
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