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Best Motion Sensor Lights

last updated Mar 05, 2019

The brilliant mind that conceived the idea of a light that senses motion and then turns itself on should be given an award for excellence. It seems more like a luxury than a necessity but you know, there are actually quite a few practical uses for one. For example, if you live in a rough and tough neighborhood, it can scare off possible intruders. Also, if you work third shift or need to see at night on a regular basis then one can come in handy. Of course, some are designed for indoor use ich can also be helpful. Either way, most people will have logical reasoning behind wanting a motion sensor light. It never hurts to have some extra help in making a buying decision, which is exactly why we created the guide below.

In a Hurry? The test winner after 14 hrs of research

icon
Mr. Beams Stick-Anywhere
91/100 our score
Effectiveness
94
Features
91
Durability
89
Power Source
88
Value
93
Mr. Beams Stick-Anywhere
Why is it better?

The LED bulbs last up to 50,000 hours

Installation is about as simple as it gets

The materials are weather-resistant

In a Hurry? Editors choice:
Mr. Beams Stick-Anywhere
Test Winner: Mr. Beams Stick-Anywhere
Amazon Link
Researched Sources
16
Researched Sources
Reviews Considered
1.4k
Reviews Considered
Hours Researching
14
Hours Researching
Products Evaluated
16
Products Evaluated
Last Updated:
Jordan Coleiro
By Jordan Coleiro:

This buying guide for motion sensor lights has been put together to show you the best researched and reviewed products to ensure your home is protected and you can see where you are going if walking around your house at night. A great motion sensor light to keep your eye on is the Mr.Beams Stick-Anywhere. We love this addition because it is known for lasting a very long time, being simple to install, and being weather-resistant.

Sorting Options
Effectiveness Features Durability Power Source Value By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91
Effectiveness
94 %
Features
91 %
Durability
89 %
Power Source
88 %
Value
93 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$19.99
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.6
Effectiveness
92 %
Features
92 %
Durability
92 %
Power Source
88 %
Value
89 %
Price Comparison Last Updated (13.11.19)
Amazon Link
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.4
Effectiveness
93 %
Features
90 %
Durability
91 %
Power Source
90 %
Value
88 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$51.99
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.6
Effectiveness
94 %
Features
86 %
Durability
89 %
Power Source
87 %
Value
92 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$32.99
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.4
Effectiveness
88 %
Features
89 %
Durability
88 %
Power Source
91 %
Value
91 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$49.99
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.8
Effectiveness
89 %
Features
89 %
Durability
86 %
Power Source
88 %
Value
87 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$42.99
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.2
Effectiveness
88 %
Features
84 %
Durability
84 %
Power Source
89 %
Value
91 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$14.95
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87
Effectiveness
87 %
Features
87 %
Durability
88 %
Power Source
86 %
Value
87 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$28.68
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86.8
Effectiveness
88 %
Features
88 %
Durability
88 %
Power Source
83 %
Value
87 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$30.48
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86.2
Effectiveness
87 %
Features
86 %
Durability
85 %
Power Source
87 %
Value
86 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$10.91

Top Ten Best Motion Sensor Lights

1. Mr. Beams Stick-Anywhere

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
91
Mr. Beams Stick-Anywhere
Amazon Link
Effectiveness
94
Features
91
Durability
89
Power Source
88
Value
93
best offer for today
Amazon Link
$19.99
Pros:

The LED bulbs last up to 50,000 hours

Installation is about as simple as it gets

The materials are weather-resistant

Cons:

A more secure adhesive should have been used

Mr. Beams is right back and this time, they present the first indoor model on this list. Motion sensor lights are not only ideal for outdoor use as with these, it is proven that they can be quite useful indoors.

Read more

Performance
With each individual model emitting 20 lumens of light and covering 10 square feet of coverage, you can see why these are mostly suitable for indoor use.

Design Features
After 30 seconds of no motion, these are going to shut off until they detect motion again. Also, the motion sensors have a detection range of nine feet.

Build Quality
Though these are made of plastic, they are actually weather-resistant. So, if you wanted to, you could place them outdoors.

Power Source
With just a single set of four AA batteries, you can expect each light to provide more than 80 hours of battery life. All things considered, that is pretty good.

Value
Indeed, this comes with more than one motion sensor (you can get packs of three, four or six). The price for each set is almost unbeatable, as well.

Overall
Are these going to light up New York City? No, but, at 20 lumens each, they will be able to handle small rooms and possibly even narrow hallways at night.

2. Leonlite Outdoor

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.6
Leonlite Outdoor
Amazon Link
Effectiveness
92
Features
92
Durability
92
Power Source
88
Value
89
best offer for today
Amazon Link
Pros:

Has a lifespan of 50,000 hours

It is both ETL and DLC listed

Backed by a five-year warranty

Cons:

Installation can take some time

This is yet another model that is suitable for outdoor use but this time, it is not powered via solar energy. Instead, it requires AC power but it is worth it thanks to the dual heads that offer 1800 lumens of light.

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Performance
As mentioned, this can deliver up to 1800 lumens of light which is very good. On top of this, this comes with a claimed sensor range of 70 feet (although some users feel this is not accurate and is a bit lower).

Design Features
Looking past the 360-degree adjustable head, this is equipped with three operation modes. You have on-time mode (for manual control), auto mode (which is what it sounds) and dusk-to-dawn mode (which emits light from dusk until dawn).

Build Quality
Not only is this made of die-cast aluminum but it is also waterproof per IP65 standards. This is an ideal combination when it comes to outdoor use.

Power Source
While other options on this list will be battery-powered, this bad boy actually requires AC power. Be aware, also, as some users have documented issues with the installation.

Value
There are no other seller options available for you to choose from and you just get the one light with your purchase.

Overall
Without question, this is one of the better and more complete designs on the market. It is equipped with fantastic functionality, performance and also build quality.

3. Litom LED Solar

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.4
Litom LED Solar
Amazon Link
Effectiveness
93
Features
90
Durability
91
Power Source
90
Value
88
best offer for today
Amazon Link
$51.99
Pros:

Each light is waterproof per IP65 standards

Features an illumination range of 270 degrees

They can deliver up to 420 lumens

Cons:

The time they stay on can’t be adjusted

In the world of solar lights, there are many that resemble this design from Litom. There is a reason they are so popular, this model in specific, as they provide excellent lighting with efficient solar powering.

Read more

Performance
Each individual model is equipped with 24 upgraded high power LED bulbs and can reach 200 square feet. This means that if they are used in the same area, they could illuminate 800 square feet.

Design Features
Though you are not granted the ability to adjust the time the light is actually emitted, you can switch between three different working modes which is nice.

Build Quality
First off, this set is made of high-strength ABS material and this provides it structural strength. Also, though, each model is IP65 waterproof to handle inclement weather.

Power Source
Indeed, these are powered via solar energy. Due to this, each model will need to have direct contact with the sunlight to ensure optimal performance (the energy will be stored).

Value
If you wanted to, you could buy this individually. Of course, the options are also available for a pack of two or a pack of four.

Overall
It is not difficult to see why this motion sensor light has received such acclaim from the users who have actually used it. The fact that it is solar-powered is merely the icing on the cake.

4. URPower Security

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.6
URPower Security
Amazon Link
Effectiveness
94
Features
86
Durability
89
Power Source
87
Value
92
best offer for today
Amazon Link
$32.99
Pros:

There are both negative and positive pole directions on the bottom of the LEDs

Each one is waterproof per IP64 standards

Comes in a pack of four

Cons:

Can dim over time

If this were a popularity contest, this right here would be your undisputed victor. But, this is not a popularity contest and is a quality and practicality contest. Well, this still ranks well in that class.

Read more

Performance
Do note that these motion sensors will emit their lighting at an angle and not straight down. But, thanks to the eight integrated LED bulbs, it is able to deliver optimal performance.

Design Features
With the automated switch, this is going to turn the LEDs on at night when the sensor detects motion. The range at which this happens is 10 feet (with a 120-degree sensing angle).

Build Quality
Do not worry about this becoming damaged during inclement weather as it is IP64 waterproof to combat most inclement weather.

Power Source
With the integrated solar panel built-in, this draws energy from the sunlight and can charge in six to eight hours (with optimal sunlight exposure).

Value
This is actually a pack of four and for the price of admission, the value here is tremendous.

Overall
While this set of four from Urpower is far from perfect, the equipped LEDs offer enough illumination to perform what they were set out to achieve.

5. Maxsa Innovations

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
89.4
Maxsa Innovations
Amazon Link
Effectiveness
88
Features
89
Durability
88
Power Source
91
Value
91
best offer for today
Amazon Link
$49.99
Pros:

The solar panel is detached from the light

There are three dials for adjusting settings

It is ideal for many outdoor areas

Cons:

For larger areas, it may not be bright enough

Not only does the top model on this list sport a dual head but it is also powered via solar energy. Plus, with its 40-feet activation sensor, it really is one of the best.

Read more

Performance
The two heads allow more distance and area to be covered and, all in all, they both produce over 160 lumens of light to illuminate the path or area. Plus, this uses LEDs.

Design Features
Many users will really appreciate the adjustable settings of this design. The sensor range can be adjusted from 10 to 40 feet and the duration from 10 seconds to four minutes.

Build Quality
In addition to the fact that this is rated per IP44 standards of protection, this also is built with high-density polyethylene (which is a heavy-duty plastic that can withstand abuse).

Power Source
When fully charged, the three rechargeable batteries can deliver up to 90, one-minute activations. Again, the batteries achieve their power via solar energy and the solar panel is detached from the main unit.

Value
You only get the one model with your purchase here but the value still remains sufficient no matter.

Overall
Probably the only reason you would not want this model is if you need to illuminate a larger surface. It is a bit limited with its lumen rating but if you can accept that, the rest will be history.

6. Mr. Beams Spotlight

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.8
Mr. Beams Spotlight
Amazon Link
Effectiveness
89
Features
89
Durability
86
Power Source
88
Value
87
best offer for today
Amazon Link
$42.99
Pros:

Turns off 30 seconds after any detected motion stops

Comes in packs of two, three or four

The wireless installation is a breeze

Cons:

Though advertised as weatherproof, weather damage has been a common issue amongst users

Mr. Beams is one of the more recognizable names when it comes to this technology. This model right here is one of their very best, even if it does have some areas of concern.

Read more

Performance
Each individual model you receive (as there are packs available) can cover 400 square feet and can output 140 lumens. If you combine two or three of them, the performance becomes pretty solid.

Design Features
After the motion has stopped, this is going to stop emitting after 30 seconds has passed. That is pretty much the extent of the design features.

Build Quality
Now, Mr. Beams designed their model to be weatherproof. The problem is, several users have commented on the lack of protection outdoors. As such, moisture can get inside and corrode the interior components.

Power Source
Because each of the lights you receive is run via batteries, they can be installed wirelessly. With an average use of around 10 activations a day, the batteries can last up to a year.

Value
Provided you can either buy these in a pack of two, three, or four, the value is quite good. If you want, though, you can simply opt for the single pack.

Overall
The rather lackluster weatherproofing of this model certainly hurts. But, the overall performance when you pair a couple of these together does make up for it.

7. Milex LED Spotlight

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87.2
Milex LED Spotlight
Amazon Link
Effectiveness
88
Features
84
Durability
84
Power Source
89
Value
91
best offer for today
Amazon Link
$14.95
Pros:

The head is adjustable

Sports LED technology

The installation is a breeze

Cons:

Not fully weather resistance

At its core, the finishing entry on this list is very simple and effective. Though the weather-resistance could have been improved, it is a solid design for the right folks.

Read more

Performance
Though this is advertised as a spotlight, it is not so much that as it is a lamp (not literally). This just gives you perspective on its capabilities.

Design Features
Overall, there is a lack of features and settings here. But, the heads can be rotated which is a nice feature.

Build Quality
Okay, this is supposed to be sealed for protection but it appears that it is not (based on consumer feedback). As for the main construction, this is made of acrylic.

Power Source
It is noted that this is solar-powered and as such, you will need to install it in an area that receives optimal exposure to sunlight.

Value
This is not the worst value out there because of the price but you only receive the one fixture.

Overall
Milex is not going to blow you away with their design. Still, it is quite the popular model they have designed and most users have been satisfied with it.

8. Mr. Beams MB572

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
87
Mr. Beams MB572
Amazon Link
Effectiveness
87
Features
87
Durability
88
Power Source
86
Value
87
best offer for today
Amazon Link
$28.68
Pros:

Designed with LED bulbs

Sports an automatic shut off to conserve battery life

Built with weather-resistant materials

Cons:

In terms of brightness, they could be improved

Whether you are looking to accent your garden at night or simply want your pathway illuminated during nighttime so people can see, these lights can be the answer.

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Performance
To fully illuminate a walkway, you will need to buy the pack of six here. That is because each unit can only emit 35 lumens of light.

Design Features
Up to 15 feet away, these will be able to detect motion. As for how long they stay illuminated, you can select from one of two options (either 20 seconds or 60 seconds).

Build Quality
Due to the fact that each one of these has been designed with tight seals and UV-resistant materials, they will handle the vigorous nature of the outdoors.

Power Source
No wires are needed for installation because each separate model is run via batteries. If they were to run for around 50 hours, then you could expect them to last for around a year before new batteries would be needed.

Value
Though the price is not that much better, if you want, you can get these in a pack of six (or simple a two-pack if that is all you need).

Overall
Yes, these are limited when it comes to illumination strength. But, if you get a bunch of them, they can be a great solution for lighting up your pathway at night.

9. Heath Zenith Shaker

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86.8
Heath Zenith Shaker
Amazon Link
Effectiveness
88
Features
88
Durability
88
Power Source
83
Value
87
best offer for today
Amazon Link
$30.48
Pros:

Comes in silver and oil rubbed bronze

Can be used as a lantern or as a coach light

Three different modes of illumination are integrated

Cons:

It does not use LED bulbs

For certain, this is unique when compared to the other models on this list. While you need to supply the light bulb, the elegant and weather-resistant rubber bronze metal construction is a sight for sour eyes.

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Performance
It is important to note that this Shaker Cover does not accept LED bulbs. Instead, it uses a 60-watt incandescent bulb (which you have to account for yourself).

Design Features
This actually is equipped with handy design features. Firstly, you can choose the amount of time that the light illuminates (either one, five or 10 minutes). Secondly, you can switch this to deliver constant light if you desire.

Build Quality
The construction here is fantastic. In addition to the oil rubbed bronze metal, this comes with clear seeded glass and also a weather-resistant finish.

Power Source
Again, an incandescent bulb is required for operation. So, technically, that is the power source here and once it runs out you will merely need to replace the bulb.

Value
Just the one fixture comes with your purchase here (although you can select between either oil rubbed bronze or silver).

Overall
Come to think of it, this is one of the few options on this list that does not use LED bulbs. This is definitely a disadvantage but the construction and appeal may be too great to pass up.

10. First Alert PIR725

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86.2
First Alert PIR725
Amazon Link
Effectiveness
87
Features
86
Durability
85
Power Source
87
Value
86
best offer for today
Amazon Link
$10.91
Pros:

Can be useful if you forget to turn the lights on or off

Will screw into any existing indoor socket

Works with both fluorescent and incandescent bulbs

Cons:

Comes on during the day which can deplete the bulb

Now, this is interesting here. First Alert designed their model to install into your existing light socket. Then, all you need to do is install a fluorescent or incandescent bulb into this and you will have motion detection equipped.

Read more

Performance
This is another model that does not utilize LED bulbs. Instead, this works with either 50-watt fluorescent bulbs or 100-watt incandescent bulbs.

Design Features
The 360-degree motion detection and 12-foot detection range are nice features. Yet, one huge issue with this light socket is it will come on during the daytime (which can be problematic in heavier traffic areas).

Build Quality
Truth be told, the build quality is not really a concern here. This will never be outdoors and it simply needs to be inserted into an existing light socket.

Power Source
The power source is going to be the bulbs that you purchase alongside this as this technically does not work on its own.

Value
With your purchase, you simply get the one socket. Overall, it is not the best value out there considering you have to keep purchasing light bulbs.

Overall
For some of you, this will be a nice option. However, it is worth noting that not everyone will find a use for this type of design. It really just depends on your needs and wants.

Criteria Used for Evaluation

Effectiveness

With any type of light, you need to look at the specs to see if it will perform to your liking.

Light is needed in this world for illumination and when you want it from a specific source, that source needs to be able to perform to your standards. In this case, there are a number of factors and features that you need to assess. Of course, when it comes to lighting, it all begins with the type of bulbs that are used. Without question, the king of efficiency in this area is LEDs. Though other types will typically be brighter (such as incandescent bulbs), LEDs are way more efficient and will last much, much longer.

Next up, you need to assess two specifications and the first is the lumen rating. Lumens are the main measurement of light and can help determine the brightness. Clearly, the higher the lumen rating the brighter the light will be. If you are looking to illuminate larger areas you may want to shoot for 1000 to 3000 lumens. The other specification to look for is the covered distance. For example, the bulbs may illuminate 200 square feet and along with the lumen rating, this will provide you with the information you need to fit your needs.

Features

As with most technology devices on the market, there are going to be some key design features to look out for here.

Always remember that these types of devices do integrate technology and, because of that, they will sometimes integrate different types of features. At their core, motion sensor lights will be able to detect motion from a certain distance. Now, as for this certain distance, some models will integrate superior sensors that will be able to detect motion from farther distances and from wider angles. Along the same line, other models will come equipped with heads that can be adjusted and this can be a nice feature.

But, there is one key addition to some designs that will make or break the entire device for some of you. This is alluding to the adjustability of the settings. Some of you will settle for nothing less than the ability to change the light duration, among other things. If you are stuck with the default light duration (which could be an issue if it is only 30 seconds, for example) then it can really hamper the device. For the record, this is referencing how long the lights will stay emitted after they detect motion.

Durability

Not only do outdoor models need to be built well but they also need to withstand the mood swings of Mother Nature.

It was alluded to a few times during this guide that you can invest in either indoor or outdoor motion sensor lights. Some of them will even be tailored to both uses but you can make it a bit easier on yourself if you determine what you need beforehand. If all you want is a model for indoor use (to illuminate staircases at night, for example) then you really will not need to worry too much about the build quality (though you still ideally do not want a cheaply built design). Yet, for outdoor installation, the build quality becomes vital. Clearly, this is due to the vigorous nature of the outdoors and the inclement weather.

So, you need to keep a few things in mind. Firstly, what materials are utilized? Common materials can be ABS plastic (or other types of heavy-duty plastics) and even metal (such as die-cast aluminum). Granted the materials themselves have been engineered to resist corrosion and are weather-resistant, you should be good to go. Speaking of weather-resistance, you should also pay close attention to the accompanying IP water rating. The second number of this IP rating refers to the product’s protection against water. The higher the number the better and once IPX7 is achieved, a product can officially be dubbed waterproof.

Power Source

Not all models will be powered in the same fashion and deciding upon the power source you prefer is ideal.

To be honest, you can really tailor your selection on the type of power source that you prefer. Because motion sensor lights can be powered in a variety of different ways, it is important to determine which power source/sources you prefer. For starters, some units may require hardwiring. While the installation process is a bit more strenuous for this power source, it may not be as bad as you think. The benefit to this is you never need to worry about changing batteries. Speaking of batteries, this is another common power source.

This is probably the most user-friendly source as the installation will be a breeze. Of course, you will need to change the batteries if they become depleted (which they will). But, some models will come equipped with solar panels which will then utilize the power from sunlight. Granted you install the light in an area that receives optimal sun exposure, this can be a very efficient and convenient manner of power.

Value

What is better than one light? How about a pack of two or four?

Here is the deal; there is a strong chance that you will want or need more than one light. It does depend on the specifications of a specific model but the option of being able to place the motion sensors in different locations is nice. So, you can do one of two things if you are interested in buying more than one. Firstly, you can simply buy the individual model in a certain quantity. Or, you can specifically look for sellers who will offer their model in packs. This happens on occasion and if you can get a deal for four or six lights, for example, why not take advantage of it?

Expert Interviews & Opinions

Most Important Criteria (According to our experts opinion)
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expert tips icon
Effectiveness

It goes without saying that not all lights will be able to perform with the same efficiency. A number of key features come into play and it will be important for you to take each and every one of them into consideration. For example, you need to select the type of bulbs you want, how bright you want them to shine, and how much coverage you want them to achieve.

Features

As with most technology devices and tools on the market, design features are going to come to the forefront here. While these devices are very simple at their core, their functionality can be enhanced for your benefit. With certain features built-in, such as the ability to change the light duration or a head that can be adjusted to emit at any angle, the entire design can be enhanced for your benefit.

Durability

Okay, so if you are intending on buying an indoor model then this section is not going to be too big of a concern, admittedly. The same can’t be said about outdoor models and, without question, the build quality is as important as any other criterion on this list. What you really need to look for is materials that are high in quality and weather-resistant. To do so, assess the materials themselves and the IP water rating of the device.

Other Factors to Consider

Ease of Use

When looking at investing in a set of motion sensor lights, you want to keep in mind how easy they are to install and use. This is important as if you purchase a set of motion sensor lights but need an electrician to install it can get quite expensive.

It is best to review customer reviews to see a first-hand account on how easy these lights are to install from customers that have purchased these lights. This way you get a number of reviews about the product and will know if it worth the investment or should you start looking at another set of motion sensor lights.

Frequently Asked Questions

q: Do sellers offer options that activate in daylight?

a:

Most of the time there will no be much of a need for motion sensor lights in the daytime. Yet, there may be some instances where you need more light in a room. But, the issue is most models are designed to activate only at night because otherwise, energy would be wasted because nine times out of ten, day-time activation will not be needed. Still, certain sellers, such as Mr. Beams, may do something for you if you request it specifically.

q: Will a power outage affect sensor lighting?

a:

One of the biggest advantages of battery-operated models has not been discussed yet. It was saved for this question because it seemed like the perfect place. If you have a battery-operated model then no, power outages will not affect you. Because they run off of their own batteries, they will not be affected by your home power. Yet, if the unit is hardwired then they will not function unless your home is supplied with power. This is definitely something to keep in mind if you deal with power outages more often than the average person.

q: Why are false detections occurring?

a:

Would it not be nice if everything in this world was foolproof? Unless you are asininely ignorant, you know that this is not the case. Well, as you may have guessed, there can be issues that arise when you own a motion sensor light. One of the more common issues can be false detections. As will be touched on in a little bit, some models sport sensors that can ignore large and small pets. But, if they do not sport special sensors, animals can set off the light. As for indoor use, it could be something as simple as a curtain moving due to roaring winds.

q: What to do if you put the batteries in and the unit still does not turn on?

a:

Speaking of issues, this is when you know something could be wrong with your unit. Firstly, when you are installing new batteries, ensure that they are actually new. Batteries will self-discharge over time and it is possible that they are simply out of juice. Also, ensure that you actually install them correctly into the unit. If you know for a fact that the batteries are new and that you have installed them correctly and the unit still will not turn on when you walk across it (assuming you are doing so in a dark room), then you may need to get ahold of the seller or manufacturer.

q: Can pets trigger them?

a:

It was mentioned earlier that certain models can avoid detecting small or large animals or pets. Not all sensors will be able to intelligently perform this but some passive infrared sensors do possess the ability. If this is a big deal, then make sure you buy a unit that integrates a sensor that is capable of doing this. Unless you have a pet that is constantly triggering the motion detection, though, this will probably not be too big of a deal.

q: Can you test one?

a:

Yes, you can test one and it is really not too difficult to do so. As mentioned earlier, install new batteries and do so correctly to ensure optimal performance. Now, in any dark room, go ahead and place it temporarily as all you want to do is test it to see if the unit is working correctly. Once you have done this, allow the automatic shut off to kick in (which will vary depending on the model). Now that it is off, walk into the dark room and the unit should illuminate. Walk out afterward and if it shuts off at the desired time, you have a system that is functioning correctly. Clearly, if not, there may be some internal issues.