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If you suffer from seasonal affective disorder, where your mood drops when the days get shorter, these light therapy lamps can offer some relief.

Sarah Mitroff is a Managing Editor for CNET, overseeing our health, fitness and wellness section. She's written for Wired, MacWorld, PCWorld, and VentureBeat.

Many people like me, who live in more overcast climates, deal with seasonal affective disorder  (aka SAD) or seasonal depression. This is brought on by the shorter and colder days of autumn and winter and can have a huge impact on my energy level and overall mood. With the end of summer slowly creeping toward us, I can look forward to several months of feeling sluggish, depressed and lethargic. 

When the days get shorter and darker, we get less exposure to natural sunlight. Doctors believe that the lack of sunlight can trigger a chemical change in the brain, which can make you feel sad, unmotivated, sluggish and, essentially, depressed. When my psychiatrist diagnosed me with SAD, she recommended light therapy, one of the most popular treatments and one that's backed up with a ton of documented research.

Light therapy lamps try to mimic the extra hours of sunlight from spring and summer that we don't get in fall and winter. For this, you need a lamp that emits about 10,000 lux of light, which is higher than the artificial light from your home's fixtures and other lamps. A bright sunny day exposes you to about 100,000 lux or more, while you might get only about 2,000 lux of light exposure on an overcast day. A light therapy session can mimic the experience of a sunny day -- minus the ultraviolet rays -- if only for a few minutes.

I've tested and evaluated some of the most popular light therapy lamps on the market. There are a lot of options out there when it comes to selecting a light therapy device -- they vary in intensity, and some even offer adjustable brightness. Because I'm not a physician or psychiatrist, I can't tell you if these lamps will be effective for treating your depression, winter blues or SAD symptoms. However, as someone who experiences SAD symptoms and seasonal depression and has used light therapy as a treatment, I can suggest which lights may be worth your money.

Light therapy isn't for everyone, so it's important to check with your doctor before trying it. Only your physician can diagnose you with SAD, a mood disorder, or depression and prescribe the correct treatment for you. This list is updated periodically.

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Verilux is one of the biggest names in light therapy lamps -- you'll find them all over Amazon and the company has a large catalog of models. The HappyLight Luxe has a simple design with a large light panel that takes up nearly the entire lamp. Simple is not meant as an insult here -- the Luxe light therapy lamp has everything you need at a fair price.

Most experts recommend using a lamp with a large light panel -- ideally 12 by 15 or 12 by 18 inches -- to get the full benefits of light therapy. A smaller light therapy lamp can provide the same benefits, but you might need to move it closer to your eyes and leave it on for longer than you would with a large panel. At 6 by 9 inches, the Luxe's light panel gets close to the recommended size without taking up too much space.

It offers four brightness settings and three color temperature settings, which allow you to make the light warm, neutral or mimic daylight. There's also a built-in timer you can set at 5-minute intervals, up to 1 hour. You can mount the light panel on the wall, or use the included stand, which tilts the lamp at an angle. You can also remove the stand and conveniently hook it to the back of the light panel for travel.

If you're not sure if light therapy is right for you, start with a smaller and less expensive lamp. This is the light therapy device I bought for myself back in 2019 and tried out for several months. It's just like the Luxe light therapy lamp, but more compact and with fewer features. This LED bright white light therapy lamp comes with three brightness levels. Bright light therapy can improve sleep, boost mood and increase energy.

The three brightness settings, each delivering slightly different amounts of lux -- 5,000, 7,000 and 10,000. Like the Lux, it comes with a stand that sets the light panel at an angle. The simple design takes the guesswork out of using a therapy lamp. Just set it on a surface close to your face and turn it on.

The VT31's light panel is around 4.5 by 7 inches, so you may need to use it longer than the Luxe to get the same effects. At around $40, it's a good introduction to light therapy.

I liked this lamp out of the box. It's slim enough to fit in any tight space or crowded desk, and it feels solid. It has a modern look to it that doesn't scream "I am a therapy light," and it folds down when you're not using it. It has a simple power button that cycles through three light levels: low, medium and high.

What makes this lamp different from the rest is that you can fold and rotate the light many different ways to get the perfect angle. You want the light to be at eye level and this lamp makes that easy to accomplish.

The only knock I have against the Lumos is that it has the smallest light panel out of all the lamps I tested, at just 1.37 by 6.25 inches. Again, consult with your doctor on how long you should use a therapy lamp each day -- with the smaller panel on this light, you might need to use it longer.

Can't decide between the Lumos and HappyLight VT31? If you want a therapy lamp that you can keep out all the time that you can position perfectly, get the Lumos. If you want a lamp that you don't have to fuss with, get the VT31.

Depending on where you live, how many hours of sunlight you get each day and your individual mental health needs, your doctor might recommend you get a large light panel. In that case, get the Boxelite. 

It's a 12.25 by 15.25-inch light therapy box that's one giant light panel. Despite its size, it manages to be sleek with a design I don't feel compelled to hide in a closet when it's not in use. The Boxelite light box doesn't have any frills -- there's just an on-off switch -- and I don't mind that at all. What's unique about this light therapy box is that you can change the bulbs when they burn out.

I see this as a good buy for someone who lives far north of the equator in winter, where you get 8 hours of daylight or less, and needs to use a light therapy box daily during fall and winter, year after year.

Let's be real, you buy the Lattice because you want a light therapy lamp that's stylish, not utilitarian. The Frank Lloyd Wright-esqe design is meant to blend into your decor -- even up close, it doesn't look like a light therapy lamp. The light panel is on the smaller side of the options on this list, but I do like that it's up a bit higher to better align with eye level.

Like the Lumos, this has three lighting settings, but that's it for extra features. The light panel measures at 2.75 by 8 inches, so it's on the smaller end. The design is pleasing to look at, but otherwise the lamp feels a bit plasticy for the price. 

Unless you really want a therapy lamp with extra style, you're better off buying the HappyLight Luxe, which has a bigger light panel and more features for the same price.

HappyLight Alba is the latest therapy lamp from Verilux, and it offers the same features as the HappyLight Luxe in a smaller size and for less money. It has four brightness settings, three color temperature settings and a timer that you can set in 10-minute intervals up to an hour.

The round shape is a departure for Verilux, which traditionally makes rectangle panels. At just 5.5 by 6.5 inches, Alba has a smaller light panel than the VT31. Given that bigger light panels are considered better for delivering as much light as possible in the least amount of time, I'm inclined to pick a bigger lamp, such as the HappyLight Luxe or VT31, over this.

However, you can't beat this lamp for features and price. For $10 more than the VT31, you get the color temperature settings and a timer that neither of those lamps have. Plus, you get a larger light panel than the Lumos. If those settings really call to you, then this lamp is a good buy. Personally, I get by just fine without them.

The Theralite has a clever design, but not enough features to blow me away. This lightweight and compact light box has a 5- by 8-inch light panel, plus a built-in cover and stand, which makes it good for traveling. However, it is considerably thicker than the other lamps on this list. It has one brightness setting -- 10,000 lux -- and a simple on-off switch. I like that you can adjust the angle of the stand, change the height of the light and rotate the light between portrait and landscape orientations.

It's not the best compact therapy light in my book, and I'm not convinced that this is the best travel light either. I'd rather make room in my bag for the Verilux HappyLight or the Lumos, since it can be folded and rotated to make it thin and compact. 

The Carex Day-light Classic Plus lamp is by far the largest lamp on this list, with a light panel that's 13.5 by 15.5 inches. While that's just barely bigger than the Boxelite, the lamp's larger stand makes it take up far more space, measuring 31.1 inches tall, 15.75 inches wide and a full foot deep.

There's an adjustable stand that positions the light panel at eye level or above with the light shining down, which, according to some sources, is important. Still, this lamp is a behemoth and something you'll likely need to make room for in your home. Because it's big and heavy, stashing it away when you're done using it each day isn't practical. 

This bright light therapy lamp doesn't get any accolades for style -- it looks like a 2001 flat screen TV. I could get past the dated design if the lamp felt sturdy, but the fit and finish is sloppy, with gaps between the plastic pieces and buttons to adjust the stand that are hard to press. 

It comes with two light modes: Task (5,000 lux) and Therapy (10,000 lux). Like the Northern Light Boxelite, the Carex Day-light Classic Plus is better suited for someone who gets very little natural daylight, such as someone who works in a windowless office or lives in areas that get limited natural light in the winter. If you don't mind unwieldy size and dated design, and want to save a few dollars from the Boxelite, this will serve you well.

The most important features you should be looking at when buying a light therapy lamp are the light intensity and the type of light that's emitted. Research supports using a SAD lamp with up to 10,000 lux as a therapy for depression.

Another key is that you don't want a sun lamp that emits UV rays (or at least filters them out), as that can cause damage to your eyes and skin. While you're not supposed to stare directly into a light therapy lamp, you still don't want to expose yourself to daily UV radiation while trying to treat your seasonal depression.

Size is important, to a point. A bigger light panel allows you to position the light farther away while you're using it, so keep that in mind when shopping. A smaller lamp needs to be closer to your face, and set so it's at your eye level. You might need to spend up to an hour each day using a small SAD light, but just half that with a larger lamp.

As the Mayo Clinic notes, "The effectiveness of a light box depends on daily use, so buy one that's convenient for you." 

As far as how to use a light therapy lamp, you'll need to consult with your doctor or psychiatrist for their guidance on light treatment. Light therapy isn't suited for all kinds of mental health issues -- for instance, many doctors recommend that people with bipolar disorder avoid it. Light therapy can also irritate your eyes or skin if you have certain medical conditions or are taking some prescription medications.

There are, however, some general guidelines you can follow:

Some people experience headaches, jitters or insomnia with light therapy, so that's something to look out for.

The information contained in this article is for educational and informational purposes only and is not intended as health or medical advice. Always consult a physician or other qualified health provider regarding any questions you may have about a medical condition or health objectives.