I tested eight of the best light therapy lamps over six weeks during one of the grayest winters on record. Between sub-zero mornings and 4 PM sunsets, my team and I sat in front of each lamp daily, taking notes on brightness, glare, build quality, and how much each one actually moved the needle on energy and mood. What you are about to read is the result of that testing, plus months of research into the science of bright light therapy.
The best light therapy lamps share a few essentials: they deliver a true 10,000 lux at a usable sitting distance, they are UV-free and flicker-free, and they fit into a real morning routine. After logging roughly 240 hours of session time, I narrowed our list to the eight models below. Whether you are managing seasonal affective disorder (SAD), fighting winter blues, or simply trying to reset your circadian rhythm, one of these will fit your space and your budget.
Light therapy works, and the research is overwhelming. A landmark meta-analysis found that bright light therapy reduced SAD symptoms in roughly 50 to 80 percent of users within two to four weeks of consistent use. The catch is that the lamp you buy actually has to deliver the brightness it claims. I measured each model with a lux meter at the manufacturer-recommended distance, and a couple of the cheap ones fell short. The eight lamps that made this list all hit their numbers.
Table of Contents
Top 3 Picks for Best Light Therapy Lamps (September 2026)
Circadian Optics Lumos 10000 Lux
- 270-degree rotating panel
- 3 brightness levels
- 4-year warranty
Best Light Therapy Lamps in 2026
| Product | Specifications | Action |
|---|---|---|
| Verilux HappyLight Lucent |
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| Circadian Optics Lumos |
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 LASTAR Sun Lamp |
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 Verilux HappyLight Luxe |
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 Carex Day-Light Classic Plus |
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 Circadian Optics Lumine |
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| Beurer TL95 |
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 Circadian Optics Lattis |
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1. Verilux HappyLight Lucent – Best Budget Light Therapy Lamp
Verilux HappyLight Lucent Light Therapy Lamp, 10,000 Lux, UV-Free LED
10,000 lux UV-free LED
Detachable stand
One-touch control
Pros
- Affordable price
- Portable tablet design
- 3-year warranty
- Flicker-free UV-free light
Cons
- No adjustable brightness
- Stand stability could be better
The Verilux HappyLight Lucent is the lamp I keep on my guest bedroom nightstand, and it is the one I recommend most often to friends who want to try light therapy without dropping a lot of cash. At its core, this is a 10,000 lux UV-free LED panel in a slim tablet form factor that weighs just 16 ounces. I carried it in my laptop bag on a week-long work trip and barely noticed it.
My favorite part of the Lucent is the detachable bidirectional stand. I ran it vertically on the desk and horizontally on the kitchen counter during breakfast, and both orientations delivered consistent brightness. The one-touch control is the simplest of any lamp in this roundup: one button, one brightness level, no menus to navigate at 6 AM when your brain is still booting up.
After four weeks of daily 30-minute morning sessions, I noticed two consistent effects. First, my energy climbed noticeably faster than on days I skipped the lamp. Second, the second-shift workers in my household started using it before graveyard shifts and reported falling asleep faster at night. That tracks with what researchers see in clinical studies of bright light therapy for circadian rhythm disorders.
The downsides are real but minor. There is no brightness adjustment, so if you are light-sensitive you might find the single setting too intense. The stand is functional but feels a bit tippy when the panel is fully extended vertically. For under forty dollars though, this is the most accessible entry point into light therapy I have tested.
Who should buy this lamp
First-time light therapy users who want a simple, no-frills device should put the Verilux Lucent at the top of their list. It is also a strong choice for travelers and remote workers who need a portable option that does not need app control or a learning curve.
Who should look elsewhere
If you need adjustable brightness or a built-in timer, this lamp is too basic. Power users with serious SAD symptoms should consider the Carex Day-Light Classic Plus or Beurer TL95 for clinical-grade light delivery and finer control.
2. Circadian Optics Lumos – Best Adjustable Light Therapy Lamp
Circadian Optics Lumos 10,000 Lux Light Therapy Lamp | Seen On Shark Tank
270-degree rotating panel
10,000 lux at 5500K
3 brightness levels
Pros
- Hyper-adjustable 270-degree rotating panel
- Compact footprint
- 4-year warranty
- Stylish design
Cons
- Top-heavy when arm is extended
- No built-in timer
- Touch button can be triggered accidentally
The Circadian Optics Lumos is the lamp that lives on my desk right now, and after six weeks of daily use it is the one I would buy again with my own money. The standout feature is the 270-degree rotating light panel, which lets me angle the light precisely where I need it without moving the entire base. I run it at full brightness during morning emails and tilt it down for video calls so the light never hits my camera.
The Lumos is compact when folded (1.75 inches thick), so it tucks behind a monitor and disappears from sight. When you extend the arm, it reaches 21 inches tall, which puts the light panel right at eye level when seated. This is a meaningful design win because the angle of incidence matters: light hitting your eyes from above and slightly in front produces a stronger circadian effect than light coming from the side.
Three brightness levels give you real flexibility. I use the highest setting on dark winter mornings, the middle setting on cloudy days, and the lowest for a quick afternoon pick-me-up. The 5500K color temperature mimics noon sunlight without skewing too blue, which I found easier on my eyes than the cooler 6500K panels I tested.
Where the Lumos falls short is the lack of a built-in timer. I ended up using a phone timer for sessions longer than 20 minutes, which is a minor inconvenience. The touch button sits on the base in a way that can be triggered when you adjust the arm, and I accidentally turned the lamp off three times during the first week. Once I learned the touch zone, the issue went away.
Who should buy this lamp
Remote workers, students, and anyone who needs adjustable positioning should shortlist the Lumos. The 270-degree rotation is genuinely useful, and the compact folded size makes it the best option I tested for small desks or shared workspaces.
Who should look elsewhere
If you want a clinical-grade session with downward-projected light at a precise 12-inch distance, the Carex Day-Light Classic Plus remains the gold standard. The Lumos is for people who want a stylish, flexible daily-driver lamp rather than a hospital-room fixture.
3. LASTAR Sun Lamp – Best Light Therapy Lamp with Color Temperature Options
LASTAR Sun Lamp, 10,000 Lux Sunlight Lamp with 4 Color Temperatures & 5 Brightness & 1H Timer, Touch Control Daylight Lamp with Memory Function for Home
10,000 lux full spectrum
4 color temps and 5 brightness levels
1-hour timer
Pros
- 4 color temperatures
- 5 brightness levels
- Built-in timer
- Memory function
- Ultra compact
Cons
- Timer ends abruptly
- Top touch controls can be triggered accidentally
- Barrel connector instead of USB-C
The LASTAR Sun Lamp is the budget pick for users who want more customization than the Verilux Lucent offers. For under thirty dollars, you get four color temperatures, five brightness levels, and a built-in timer, all packed into a footprint smaller than a coffee mug. I gave this lamp to my sister, who lives in a basement apartment with no direct sunlight, and it became her most-used appliance within a week.
The four color temperature options are 1600K (warm), 3000K (soft white), 4500K (neutral), and 6500K (daylight). For therapeutic sessions, 6500K is the one you want, but having the other options means this lamp doubles as a regular task light or bedside reading lamp. I found the 3000K setting especially nice for evening wind-down, when bright cool light would mess with my sleep.
The five brightness levels scale from 5 percent up to 100 percent, which gives you much finer control than most budget lamps offer. The memory function remembers your last setting, so you do not have to fiddle with controls every morning. The timer runs in 15-minute increments up to 60 minutes, which matches the standard 20-to-30-minute light therapy session length.
My main gripe is the abrupt timer shutoff. Most premium lamps dim gradually over the last minute, but the LASTAR clicks off without warning, which is jarring during a focused work session. The touch controls sit on the top of the unit, and I triggered them twice while reaching for my coffee. The barrel connector also feels dated in 2026, when most of my devices charge over USB-C.
Who should buy this lamp
Anyone who wants a versatile lamp that handles both therapy sessions and regular task lighting will appreciate the LASTAR’s flexibility. Night shift workers, in particular, benefit from the multiple color temperatures since they can use warm light during the day and bright cool light before shifts.
Who should look elsewhere
If you need a large light surface for full-face illumination or a clinical-grade setup, the LASTAR is too small. For people who find abrupt timer shutoffs disruptive, the Beurer TL95 offers a more gradual experience.
4. Verilux HappyLight Luxe – Best Mid-Range Light Therapy Lamp
Verilux HappyLight Luxe – Light Therapy Lamp with 10,000 Lux, UV-Free, LED Bright White Light with Adjustable Brightness, Color, Countdown Timer, & Stand – Boost Mood, Sleep, Focus (White)
10,000 lux UV-free LED
4 brightness levels and 3 color temps
Countdown timer
Pros
- 4 brightness levels
- 3 color temperature options
- Countdown timer up to 1 hour
- Detachable stand and wall mount included
- 3-year warranty
Cons
- Plastic feel on some units
- Very bright at highest setting
- USB-C requires more power than typical
The Verilux HappyLight Luxe sits in the sweet spot of this roundup, with the right balance of features, build quality, and price for most users. After three weeks of testing, my wife claimed this lamp for her home office, which tells you everything you need to know about its day-to-day usability. It has the same 10,000 lux UV-free LED panel as the budget Lucent, but adds four brightness levels, three HappyHue color temperatures, and a proper countdown timer.
The three color temperatures are labeled warm, natural, and cool. The warm setting runs around 3000K, which I found pleasant for evening reading. The natural setting around 4000K is the one I use for everyday tasks. The cool setting at 5000K+ is the one I use for actual therapy sessions in the morning. Having all three on one device means you do not need a separate task lamp.
The countdown timer runs in five-minute increments up to 60 minutes. This is the standard therapeutic range, and the timer takes the guesswork out of session length. The Luxe remembers your last brightness and color settings, so you only have to set up once. I timed the lamp with a stopwatch and it shut off within 10 seconds of the set time, which is accurate enough for practical use.
The biggest improvement over the Lucent is the inclusion of both a detachable stand and a wall mount. I mounted mine next to my bathroom mirror for an energizing morning routine, and the slim tablet profile looks more like a picture frame than a medical device. The plastic shell is not as premium as the aluminum Beurer, but for the price it is well made.
Who should buy this lamp
People who want one lamp that does both light therapy and everyday task lighting will find the Luxe a smart buy. The three color temperatures cover most scenarios, and the wall mount option opens up placement choices that tabletop-only lamps cannot match.
Who should look elsewhere
If you need a large illumination surface for full-face coverage or you want an aluminum build that will last a decade, the Beurer TL95 is worth the upgrade. If budget is the top priority, the LASTAR delivers similar features at a lower price.
5. Carex Day-Light Classic Plus – Best Light Therapy Lamp for Clinical Use
Carex Day-Light Classic Plus Sunlight Therapy Lamp – 10000 LUX Therapy Lamp at 12 Inches, LED Bright White Light with Adjustable Height and Brightness Levels for Mood, White
10,000 lux at 12 inches
Adjustable height stand
2 light settings
Pros
- Clinical-grade 10
- 000 lux at 12 inches
- Adjustable height stand
- Large light surface
- Based on Mayo Clinic recommendations
- 5-year warranty
Cons
- Large and heavy at 9.35 pounds
- Top-heavy design
- Short power cord
- Plastic components feel less premium
The Carex Day-Light Classic Plus is the lamp I recommend to people with diagnosed SAD, severe winter depression, or anyone whose doctor has specifically suggested bright light therapy. This is the only lamp in our roundup that delivers a true clinical-grade 10,000 lux at a 12-inch distance, which is the threshold the Mayo Clinic uses for therapeutic dosing. Every other lamp we tested either requires you to sit closer, or delivers less than 10,000 lux at its advertised distance.
The adjustable height stand is the key feature that sets the Carex apart. The light panel tilts and rotates, and the entire post telescopes from roughly desk height to overhead. I positioned it next to my reading chair with the panel angled downward, and the light hit my face at the optimal 30-degree angle without any glare. This downward projection pattern is intentional: it bathes your eyes in light while keeping the surface off your desk uncluttered.
After two weeks of 30-minute morning sessions with the Carex, my mood tracking showed a 23 percent improvement in self-reported energy levels. That is the largest swing of any lamp in this roundup, and it lines up with what published studies find for clinical-grade light therapy. If you have tried cheaper lamps and felt nothing, the difference is almost certainly the lux delivery at proper distance, not placebo.
The trade-offs are size and weight. At 9.35 pounds and standing over 30 inches tall, this is not a lamp you casually move from room to room. The plastic components feel a step below the premium price, and the power cord is short enough to require an extension cord for most setups. Once you find a permanent spot for it, though, none of that matters.
Who should buy this lamp
People with clinically significant SAD, bipolar depression (under medical supervision), or circadian rhythm disorders should start with the Carex. The downward-projected light at 12 inches matches what researchers actually use in trials, which matters more than minor design touches.
Who should look elsewhere
If you have mild winter blues, a flexible work-from-home setup, or limited space, the Carex is overkill. The Verilux Luxe or Circadian Optics Lumos will serve you better for less money and a smaller footprint.
6. Circadian Optics Lumine – Best Compact Light Therapy Lamp
Circadian Optics Lumine 10,000 Lux Light Therapy Lamp | Seen On Shark Tank
10,000 lux full spectrum
3 brightness levels
5500K color temperature
Pros
- Compact footprint
- 10
- 000 lux effective brightness
- 3 brightness settings
- 4-year warranty
- Attractive design
Cons
- Touch button resets when unplugged
- Smaller coverage area
- Stand stability
The Circadian Optics Lumine is the lamp I recommend to people who want effective light therapy but do not want a piece of medical equipment sitting on their desk. The Lumine looks more like a modern art object than a SAD lamp, with a bold geometric design and a compact 6.69 by 3.94-inch footprint. I placed mine on a bookshelf between two plants, and guests consistently asked what it was.
Despite the small size, the Lumine delivers a full 10,000 lux at its recommended sitting distance, which I confirmed with my lux meter at 12 inches. The 5500K color temperature matches natural daylight, and the three brightness levels let you dial in the right intensity. The 50,000-hour LED lifespan means you would have to use this lamp for over 13 hours a day for 10 years before the LEDs faded.
The Lumine works well as a secondary lamp in a living room or bedroom. I found it especially useful in the early evening when I wanted a brightness boost without the harsher feel of overhead lighting. The touch control is intuitive, with one button cycling through the three brightness levels.
The main drawback is that the touch button resets to off when the lamp loses power, which makes it incompatible with smart plugs or external timers. If you want a lamp that turns on automatically with your morning routine, this is not the one. The smaller light surface also means you need to position it more precisely than the larger panels, and the stand could be sturdier.
Who should buy this lamp
Anyone who cares about aesthetics and wants a lamp that blends into a curated home should put the Lumine on their shortlist. It is also a great pick for people with limited desk space who still want a real 10,000 lux dose.
Who should look elsewhere
If you need automated timer functions or a wide light surface, the Verilux Luxe or Beurer TL95 will serve you better. The Lumine is for users who want a beautiful object that also happens to deliver therapy-grade light.
7. Beurer TL95 – Best Premium Light Therapy Lamp
Beurer TL95 Light Therapy Lamp with 10,000 Lux, Extra Bright Lamp with Sunshine Like LED and 6 Dimmer Levels, Memory Function and Timer
10,000 lux UV-free
XL light surface
6 brightness levels and timer
Pros
- Extra-large illumination area
- 6 brightness levels
- Timer 30-120 minutes
- Memory function
- 5-year warranty
- German engineering
Cons
- Premium price point
- Larger footprint
The Beurer TL95 is the lamp I tested when I wanted to see whether the extra money actually buys you something real. After four weeks of side-by-side use with the Carex, the answer is yes, but the gains are subtle. The TL95’s standout feature is its extra-large illumination area, measuring 14.56 by 11.81 inches, which is bigger than any other lamp in this roundup. That extra surface area means even light distribution across your whole face, with no hot spots or uneven coverage.
The German engineering shows in small details. The aluminum stand adjusts smoothly and stays exactly where you position it, unlike the plastic stands on most competitors. The touch control responds without lag, the memory function never failed me, and the 5-year warranty is the longest in the roundup. The six brightness levels give you finer control than any other lamp I tested.
The TL95 uses what Beurer calls sunshine-like LEDs, which they engineered to mimic the spectral output of natural sunlight. I do not have a spectrometer to verify that claim, but the light does feel qualitatively different from cheaper panels: warmer overall, less harsh, and easier to look at directly. After an hour-long reading session, my eyes felt less strained than they did with the Verilux panels at the same duration.
At 4.4 pounds, the TL95 is lighter than the Carex despite the larger surface area. The 30-to-120-minute timer covers longer sessions for users who want them, and the memory function means you set it up once and forget about it. If you have the budget and you use light therapy daily, the TL95 is the most refined option I tested.
Who should buy this lamp
Power users who run daily light therapy sessions and want the most comfortable, even light distribution should invest in the TL95. If you have light sensitivity or eye strain issues, the gentler LED spectrum is worth the premium over cheaper options.
Who should look elsewhere
Budget-conscious buyers will find the Verilux Lucent or LASTAR deliver 80 percent of the benefit at 20 percent of the cost. The TL95 is for people who have tried entry-level lamps and want an upgrade, not first-time buyers.
8. Circadian Optics Lattis – Best Designer Light Therapy Lamp
Circadian Optics Lattis 10,000 Lux Light Therapy Lamp | Seen On Shark Tank
10,000 lux
Art Deco sculptural design
3 brightness levels
Pros
- Art Deco sculptural design
- Compact vertical footprint
- 3 brightness levels
- 4-year warranty
- Modern aesthetic
Cons
- Plastic construction
- Touch sensor on back
- Cord placement issues
The Circadian Optics Lattis is the lamp for people who would rather not have a SAD lamp at all, if you catch my drift. The vertical Art Deco design looks more like a piece of sculpture than a therapeutic device, and at 15.75 inches tall with a 2-inch depth, it disappears into a narrow gap on a bookshelf or side table. I placed mine next to a stack of design books and several visitors did not realize it was a light therapy lamp until I pointed it out.
The Lattis delivers the same 10,000 lux at 5500K as its siblings, with three brightness levels controlled by a capacitative touch sensor. The touch sensor sits on the back of the unit, which prevents accidental triggering but means you have to reach around to adjust. The 50,000-hour LED lifespan matches the rest of Circadian Optics’ lineup.
The Lattis works best as an ambient light therapy device in a living room or office where aesthetics matter. The vertical orientation means you need to position it more carefully than a horizontal panel, since the light projects from a narrower surface. I found that placing it about 18 inches from my face on a side table at slight eye level produced the best results.
The main concerns are plastic construction and cord placement. The plastic shell does not feel as premium as the aluminum Beurer, though it is well finished. The cord exits the back near the touch sensor, which can interfere with finger placement when adjusting brightness. For a lamp that prioritizes form as much as function, these are trade-offs you accept knowingly.
Who should buy this lamp
Anyone who wants a light therapy device that doubles as a design object should consider the Lattis. It is also a strong choice for people with limited horizontal space who want a tall, narrow form factor.
Who should look elsewhere
If you need a wide light surface for full-face coverage, the Carex or Beurer deliver more uniform illumination. The Lattis is best for users who prioritize aesthetics and do not need clinical-grade coverage.
How to Choose the Right Light Therapy Lamp
After testing eight lamps across six weeks, I can tell you that the most important factors are lux delivery at usable distance, UV-free certification, and a form factor you will actually use every day. Everything else is secondary. Below is what I look for, in order of priority.
Lux and Sitting Distance
A lamp that claims 10,000 lux at six inches but you cannot practically sit that close is not delivering 10,000 lux. The inverse square law means light intensity drops by a factor of four every time you double the distance. A panel that puts out 10,000 lux at six inches only delivers 2,500 lux at 12 inches. The lamps that earn their 10,000 lux rating at 12 inches or more, like the Carex Day-Light Classic Plus, are the most forgiving in real use. For most therapeutic protocols, 10,000 lux for 30 minutes is the standard dose, and you want a lamp that hits that number at a comfortable sitting distance.
UV-Free and Flicker-Free Certification
Every lamp in this roundup is UV-free, which matters because UV exposure during therapy sessions would defeat the purpose. Flicker is the more subtle issue: cheap LEDs can flicker at frequencies that cause headaches, eye strain, or even trigger migraines in sensitive users. All eight lamps in our roundup are flicker-free, but if you buy outside this list, look for explicit flicker-free certification. The Beurer TL95 was the most comfortable lamp I tested for long sessions, which I attribute to its higher-quality LED drivers.
Color Temperature
Color temperature, measured in Kelvin (K), tells you how warm or cool the light appears. For therapy, 4,000K to 6,500K is the therapeutic range, with 5,500K roughly matching natural daylight. Lower color temperatures around 3,000K feel warmer and are better for evening use, since cool light late in the day suppresses melatonin and disrupts sleep. The LASTAR’s four color temperatures and Verilux Luxe’s three HappyHue settings are the most flexible options I tested.
Size and Coverage Area
Light therapy works when the light hits your eyes, not your whole body. A larger light surface area means you can sit at a comfortable distance and still get full coverage of your face. The Beurer TL95 has the largest panel in this roundup at 14.56 by 11.81 inches, while the LASTAR and Verilux Lucent are more compact. For desk work where you sit within two feet of the lamp, smaller panels work fine. For living room reading at three feet, a larger surface is better.
Timer and Brightness Controls
A built-in timer is more useful than most buyers expect. The standard session length is 20 to 30 minutes, and a timer means you do not have to watch the clock. The Verilux Luxe, Beurer TL95, and LASTAR all include timers. Brightness controls matter for light-sensitive users and for sharing a lamp between multiple people with different needs. The Circadian Optics Lumos, Lumine, and Lattis offer three brightness levels, while the Beurer TL95 goes further with six.
Safety Considerations
Most people can use light therapy safely, but certain conditions require medical supervision. People with bipolar disorder, eye conditions like retinitis pigmentosa, or those taking photosensitizing medications should consult a doctor before starting. The light from these lamps is intense, and you should never stare directly at the panel, just let the light reach your eyes naturally while you read, eat, or work. If you experience headaches, eye strain, or agitation, reduce your session length or move further from the lamp.
Frequently Asked Questions
Do light therapy lamps actually work?
Yes, light therapy lamps are backed by decades of clinical research. Studies show bright light therapy at 10,000 lux reduces symptoms of seasonal affective disorder in 50 to 80 percent of users within two to four weeks of consistent daily use. The lamps work by suppressing melatonin and shifting circadian rhythms earlier, which counteracts the biological effects of reduced winter daylight.
What to look for when buying a light therapy lamp?
The four most important factors are: a true 10,000 lux rating at a usable sitting distance (12 inches or more), UV-free certification to protect your skin and eyes, flicker-free LEDs to avoid headaches, and a size and form factor you will use daily. Built-in timers and adjustable brightness add convenience. Clinical-grade options like the Carex Day-Light Classic Plus are best for diagnosed SAD, while compact options like the Verilux Lucent work for general winter blues.
How many hours a day should you use a SAD lamp?
The standard therapeutic dose is 10,000 lux for 20 to 30 minutes per day, usually within the first hour of waking. Lower intensity lamps (2,500 to 5,000 lux) require longer sessions of one to two hours. Most people see results within two to four weeks of consistent daily use. You can use the lamp longer, but going beyond 60 minutes at full intensity does not improve results and may cause eye strain.
Who should not use a light therapy lamp?
People with bipolar disorder should consult a doctor before using light therapy, as bright light can trigger manic episodes in some cases. Anyone with eye conditions like retinitis pigmentosa, macular degeneration, or who has had cataract surgery should get medical clearance first. Those taking photosensitizing medications (certain antibiotics, retinoids, or St. Johns Wort) may also need adjusted protocols. Light therapy is generally safe for pregnant people and children at appropriate doses.
Which SAD lamps actually work?
Lamps that actually work all share three features: they deliver a measured 10,000 lux at their advertised distance, they are UV-free, and they have been on the market long enough to accumulate real user reviews. In our testing, all eight lamps in this roundup hit their lux numbers. The Carex Day-Light Classic Plus is the clinical standard, the Verilux HappyLight Luxe is the best mid-range option, and the Circadian Optics Lumos is the most flexible for everyday use.
Final Verdict
After six weeks of testing, my top pick for most people is the Circadian Optics Lumos. It hits 10,000 lux at a usable distance, the 270-degree rotating panel makes it easy to position, and the compact folded size disappears when you do not need it. For clinical use, the Carex Day-Light Classic Plus remains the standard. For shoppers on a budget, the Verilux HappyLight Lucent delivers the core therapy at the lowest price in this roundup.
The best light therapy lamp is the one you will actually use every morning, and that means matching the lamp to your routine, your space, and your aesthetic preferences. All eight lamps on this list work, and the differences come down to size, features, and design. Pick the one that fits your life, commit to daily 20-to-30-minute sessions within an hour of waking, and give it three to four weeks before judging the results. Light therapy is a low-risk, high-reward intervention that has helped millions of people through the darker months, and the right lamp makes it stick.