A SAD lamp only helps if it puts about 10,000 lux on your eyes at the distance you actually sit. These light therapy lamps are ranked on that rated distance, independent lab checks, light area and price.
Daylight does most of the work for free. Start with sunlight first.
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A 2020 meta-analysis of 19 randomized trials found bright light beat placebo for seasonal affective disorder (SMD −0.37 across 18 trials and 610 patients; response risk ratio 1.42), though most trials were small and at moderate to high risk of bias. In the CAN-SAD trial (n=96), 30 minutes of 10,000 lux each morning matched fluoxetine 20 mg, with 67% responding in both groups. A 2025 meta-analysis of 11 trials (n=858) also found more remission when light was added for nonseasonal depression (40.7% vs 23.5%). Evidence that a lamp prevents SAD before symptoms start is very weak.
Outdoor light is the original light box. In a 1996 trial, a daily 1-hour morning walk outdoors put 50% of people with SAD into remission within a week, versus 25% under dim placebo light. A lamp earns its place when it is dark before work or you cannot get outside. Why morning sunlight matters.
| Product | Rated output | Lab check | Light area | Color temp | UV | Flicker | Price |
|---|---|---|---|---|---|---|---|
| Carex Day-Light Classic Plus | 10,000 lux at 12–14 in | 10,000 lux at 13 in (Yale) | 16 x 13 in | 4,000K | 100% UV blocked (brand) | Not stated | $170 |
| Alaska Northern Lights NorthStar 10,000 | 10,000 lux at 24 in | Close to 10,000 lux at 24 in (Yale) | 21.5 x 11 in (Yale) | 4,100K | UV-free bulbs (brand) | Flicker-free, 25 kHz ballast (brand) | $354 |
| Northern Light Technologies BOXelite OS | 10,000 lux at up to 14 in | 7,000 lux at ~16 in (Yale, BOXelite) | 15 x 12 in | Not stated (cool white) | No UV emitted (brand) | No flicker, electronic ballast (brand) | $255 |
| Carex Day-Light Sky | 10,000 lux at 12–14 in | 11,000 lux at 12 in (Yale, DL2000) | 13.5 x 10 in | 4,000K | 100% UV blocked (brand) | Flicker-free (brand) | $140 |
| Circadian Optics Langham | 10,000 lux at 18 in (Max) | None found | 12 x 22 in (Max) | 5,500K | UV-free (brand) | Not stated | $225 |
| Lumie Vitamin L | 10,000 lux at 20 cm (7.9 in) | None found | Not stated (lamp is 11 x 7.9 in) | 4,000K | UV-free (brand) | Not stated | $109 |
| Verilux HappyLight Luxe | 10,000 lux at 6 in | None found | Not stated (lamp is 11.7 x 7.5 in) | 3 settings, warm white to daylight | UV-free LED (brand) | Flicker-free (brand) | $70 |
Prices are approximate list prices in USD at the time we checked and change often.
Best overall
by Carex · $170
Large 16 x 13 in LED panel rated 10,000 lux at 12 to 14 in, and Yale measured 10,000 lux at 13 in. The default SAD lamp for most people.
Rated output10,000 lux at 12–14 in
Best for: Most people who want a clinic-size light box on a desk or kitchen table
Best for sitting farther back
by Alaska Northern Lights · $354
Full-size fluorescent light box rated 10,000 lux at 24 in, a figure Yale found close to its own measurement. The pick if you want to sit back.
Rated output10,000 lux at 24 in
Best for: People who want to sit about two feet away, or read and eat at a table during sessions
by Northern Light Technologies · $255
Fluorescent box from a Montreal maker, designed with CET's Michael Terman. Rated 10,000 lux at up to 14 in; Yale measured 7,000 lux at about 16 in.
Rated output10,000 lux at up to 14 in
Best for: Buyers who want the box CET sells, a seven-year warranty and adjustable legs, and do not mind fluorescent tubes
Best for small desks
by Carex · $140
Desk-lamp style Day-Light with a 13.5 x 10 in LED panel, rated 10,000 lux at 12 to 14 in. Yale measured 11,000 lux at 12 in.
Rated output10,000 lux at 12–14 in
Best for: Small desks, or anyone who wants a real 10,000 lux lamp that also works as a task light
by Circadian Optics · $225
Slim LED panel up to 12 x 22 in, rated 10,000 lux at 18 in in its Max size. Large and space-saving, but 5,500K light and no independent test yet.
Rated output10,000 lux at 18 in (Max)
Best for: People who want a large LED panel they can sit 18 in from, and accept a cooler 5,500K light
by Lumie · $109
Compact LED lamp rated 10,000 lux at 20 cm, with Lumie's own figures showing 2,500 lux at 50 cm. Honest specs, but you have to sit close.
Rated output10,000 lux at 20 cm (7.9 in)
Best for: Small spaces and people willing to sit within about 8 in, or to run longer sessions farther back
Best budget
by Verilux · $70
Cheap, slim LED panel with three color temperatures and a timer. Verilux rates 10,000 lux at only 6 in, so sit close or plan longer sessions.
Rated output10,000 lux at 6 in
Best for: Tight budgets, close-range desk use, and trying light therapy before buying a full-size box
A SAD lamp is a bright, diffuse white light you sit near for 20 to 30 minutes, usually soon after waking. The standard dose, used in trials such as CAN-SAD, is 10,000 lux for 30 minutes each morning.1 That is far brighter than ordinary room lighting; the lux levels chart puts the numbers side by side.
Morning light also moves the body clock earlier. In 42 people with SAD, morning sessions advanced the timing of melatonin release and evening sessions delayed it. In a larger sample of 80, early-morning light beat both late-morning and evening light.2 That is why most people run a light therapy lamp at breakfast, not after dinner. The SAD lamp how-to and the morning sunlight guide cover timing in more detail.
The evidence is strongest for treating SAD and weakest for preventing it.
These trials used clinical light boxes at a fixed distance. The results do not carry over to a small lamp used at arm’s length.
Light from a lamp drops off fast as you move back. Lumie’s own figures for its Vitamin L show the pattern: 10,000 lux at 20 cm, 5,000 lux at 30 cm and 2,500 lux at 50 cm. A “10,000 lux” claim with no distance tells you very little.
The Center for Environmental Therapeutics (CET), a nonprofit led by light therapy researcher Michael Terman, sets the target as 10,000 lux at a comfortable sitting distance and warns that many lamps reach it only close up.7 When Yale researchers measured 24 commercial devices, only 7 met three basic criteria: at least 7,000 lux at the recommended distance, at least 5,000 lux six inches off center, and tolerable glare. Some lamps sold as 10,000 lux hit that figure only at unreasonably close range.8
Yale’s light therapy group treats lux and time as a trade-off. Thirty minutes at 10,000 lux is thought to equal about 60 minutes at 5,000 lux or 120 minutes at 2,500 lux, and it advises aiming for at least 7,000 lux.9 A lamp rated at 6 inches can still help, but only if you sit that close or accept much longer sessions.
You can check your own setup. Yale notes that phone apps using the front camera can measure lux, or you can use a dedicated lux meter. Measure at eye position, facing the lamp. The how many lux guide explains what the readings mean.
Each lamp was scored on its rated 10,000 lux distance, independent measurements from Yale’s light therapy group where they exist, light area, color temperature, UV filtering, adjustability, warranty and return terms. Price matters at the margin. Affiliate commission does not affect rank, and none of these lamps was physically tested for this page. The full process is on the methodology page.
Lam RW, Levitt AJ, Levitan RD, et al. The Can-SAD study: a randomized controlled trial of the effectiveness of light therapy and fluoxetine in patients with winter seasonal affective disorder. Am J Psychiatry. 2006;163(5):805-812. doi:10.1176/ajp.2006.163.5.805 ↩ ↩2
Terman JS, Terman M, Lo ES, Cooper TB. Circadian time of morning light administration and therapeutic response in winter depression. Arch Gen Psychiatry. 2001;58(1):69-75. doi:10.1001/archpsyc.58.1.69 ↩
Pjrek E, Friedrich ME, Cambioli L, et al. The efficacy of light therapy in the treatment of seasonal affective disorder: a meta-analysis of randomized controlled trials. Psychother Psychosom. 2020;89(1):17-24. doi:10.1159/000502891 ↩
Lam RW, Levitt AJ, Levitan RD, et al. Efficacy of bright light treatment, fluoxetine, and the combination in patients with nonseasonal major depressive disorder: a randomized clinical trial. JAMA Psychiatry. 2016;73(1):56-63. doi:10.1001/jamapsychiatry.2015.2235 ↩
Menegaz de Almeida A, Aquino de Moraes FC, Cavalcanti Souza ME, et al. Bright light therapy for nonseasonal depressive disorders: a systematic review and meta-analysis. JAMA Psychiatry. 2025;82(1):38-46. doi:10.1001/jamapsychiatry.2024.2871 ↩
Nussbaumer-Streit B, Forneris CA, Morgan LC, et al. Light therapy for preventing seasonal affective disorder. Cochrane Database Syst Rev. 2019;3:CD011269. doi:10.1002/14651858.CD011269.pub3 ↩
Center for Environmental Therapeutics. How to select a light box. ↩ ↩2
Oldham MA, Oldham MB, Desan PH. Commercially available phototherapy devices for treatment of depression: physical characteristics of emitted light. Psychiatr Res Clin Pract. 2019;1(2):49-57. doi:10.1176/appi.prcp.2019.20180011 ↩
Yale School of Medicine, Department of Psychiatry. How should I obtain a light box? Updated February 4, 2025. ↩ ↩2
Terman M, Terman JS. Light therapy for seasonal and nonseasonal depression: efficacy, protocol, safety, and side effects. CNS Spectr. 2005;10(8):647-663. doi:10.1017/s1092852900019611 ↩
Sit DK, McGowan J, Wiltrout C, et al. Adjunctive bright light therapy for bipolar depression: a randomized double-blind placebo-controlled trial. Am J Psychiatry. 2018;175(2):131-139. doi:10.1176/appi.ajp.2017.16101200 ↩
Northern Light Technologies. BOXelite Desk Lamp OS instructions for use. ↩ ↩2
For seasonal affective disorder, yes, with modest effect sizes. A 2020 meta-analysis of 19 randomized trials found bright light beat placebo, and in the CAN-SAD trial 30 minutes of 10,000 lux each morning matched fluoxetine, with 67% responding in both groups.
Sit at the distance where the maker rates 10,000 lux, usually 12 to 24 inches for a full-size box. Check it at eye level with a lux meter or a phone lux app, because output falls quickly as you move back.
The standard dose is 30 minutes at 10,000 lux. Yale's light therapy group treats lux and time as a trade-off, so 5,000 lux takes about 60 minutes and 2,500 lux about 120 minutes.
Early morning, soon after waking. In a study of people with SAD, early-morning light beat late-morning and evening sessions, while evening light shifted the body clock later.
CET warns that UV can harm eyes and skin with long-term use, so a SAD lamp should be UV-free or UV-filtered. LED lamps and fluorescent boxes behind a UV-filtering diffuser both qualify.
People with bipolar disorder, eye disease, or who take light-sensitizing drugs such as lithium, tetracycline or St. John's Wort should talk to a doctor first. Bright light can trigger hypomania, especially in the first days of use.
