Best SAD Lamp 2026: 10 Ranked, and Why 10,000 Lux Means 12 Centimetres

One sentence puts this at the top: "Lumie Mini provides 10,000 lux at a distance of 12cm". Nine other listings quote a lux figure and none of them says where it was taken, which makes those numbers unfalsifiable rather than merely optimistic. Lumie is a British company that has been building light therapy products for three decades and sells into a regulated market, and the willingness to attach a distance is what regulation looks like in practice.

Read what the disclosure actually means before you buy, because it is not flattering to the category either. Illuminance obeys the inverse square law, so 10,000 lux at 12 centimetres becomes 2,500 lux at 24 centimetres and roughly 576 lux at 50 centimetres. Standard bright light therapy protocols call for 10,000 lux at the eye for around half an hour, which with this lamp means genuinely sitting a hand's width from it — propped beside a cereal bowl, not across a desk. That is a real constraint, and it applies just as hard to every rival here; the difference is that Lumie tells you.

It is small and it is meant to be. At 9.4 by 16.3 by 22.5 centimetres and 910 grams it travels to an office or a university library, and 4.6 stars from 252 ratings is the joint-highest average in this group. There is no timer, no colour temperature switching and no remote, which is why cheaper lamps outspec it on paper. What you are paying for is the one number that matters being an honest one.

Beurer is a German medical device manufacturer, and the listing reads like one. Instead of a single headline number it publishes a ladder: 10,000 lux for the therapy setting, 7,000 lux at 5,000K for the active setting, and 3,000 lux at 3,000K for the relax setting. Three claims that decline together in a way that is physically coherent — warmer light, less of it — which is the opposite of how the rest of this category writes copy.

It also publishes the one geometric fact that decides whether a light therapy lamp works: a light-emitting surface of 20 by 20 centimetres. Emitting area is what lets you sit further back and still receive the same illuminance, because the same lumens arrive spread over a wider cone. Four hundred square centimetres is the largest face in this comparison after the Duronic panel, and it is why this lamp is usable at a normal desk distance where the small lamps are not.

Two blemishes. The specification table describes the whole product as "6D x 20W x 2.4H centimetres" — a body 2.4 centimetres tall cannot contain a 20 centimetre emitting face, so one of those two figures is wrong, most likely a depth and height swapped in the catalogue. And the same table lists a G13 bulb base and a G40 bulb shape for what is an integrated LED panel with no removable bulb at all. At £67.99 it is the most expensive lamp here, and 214 ratings is the thinnest sample, though 4.6 stars matches the best on the page.

This is the largest light box in the comparison and the cheapest way to get a genuinely big emitting face. The bullets give the size as 34 by 9 by 43 centimetres, which is a panel you can sit in front of rather than lean into, and it comes with a folding stand and wall fixings. It is also the only lamp here that cites a medical device certification by number, 93/42/EEC, and the only listing that tells you to talk to your doctor — which for a product aimed at a depressive illness is the right instinct.

Then it quotes the wrong unit. The specification field reads "gives intensity of 10,000 lumens as recommended by medical professionals". Lumens measure total light output; lux measures how much of it lands on a surface. The clinical recommendation is expressed in lux, at the eye, and swapping the unit in the same sentence that invokes the medical directive is the most consequential error on this page. It is almost certainly sloppiness rather than deception — the lamp is sold everywhere as 10,000 lux — but it is exactly the kind of error a certified device should not make.

The listing also cannot settle on which product it is. The title says SADT2; the bullets say SADV1 three separate times. And it publishes two incompatible sizes: 34 by 9 by 43 centimetres in the bullets against "2D x 15W x 26H centimetres" in the table. At £29.99 with 369 ratings at 4.6 stars the object is good value and well liked. The page describing it needed one more read.

Twenty-two pounds ninety-nine for a flat panel measuring 17.5 by 24.6 centimetres is the best value in this comparison, and 696 ratings at 4.4 stars is the third deepest evidence here. The shape is the whole argument. A 430 square centimetre emitting face puts it behind only the Duronic and the Beurer, and well ahead of the three globe-shaped lamps at the bottom of this page, because light therapy is about how much light reaches your eye and a flat panel points all of it at you.

The practical touches are sensible rather than clever. Seven timer settings run from 10 to 60 minutes plus continuous, ten brightness levels give finer control than the four or five most rivals offer, and it either stands on a desk or hangs on a wall, which matters if your morning happens at a kitchen counter rather than a desk. It weighs 254 grams, the lightest thing here by a wide margin.

The listing publishes nothing you can verify. No wattage, no distance for the 10,000 lux, no emitting area stated as such — the panel size has to be inferred from the product dimensions, and those are given in inches first ("9.7 inch*6.9inch*0.7 inch") on a British storefront. The specification table describes a "Flanged" bulb base and an "ED17" bulb shape, neither of which exists on an integrated LED panel. Judge it on the size of the face, which you can measure, rather than on the lux, which you cannot.

The hardware is competitive. A 190 by 160 millimetre emitting face is the fourth largest here, the 180 degree rotating stand and hanging holes make it genuinely flexible, and the air-cooled chip that holds the surface under 36°C is a real feature on a panel meant to run for an hour a day. Seven hundred and forty-five ratings at 4.3 stars is the second deepest sample in this comparison.

The number on the title does not survive contact with the specification table. It advertises 15,000 lux, the largest claim in the category by 50%, and the table gives the wattage as 15 watts. Good LEDs manage 100 to 120 lumens per watt, so 15 watts puts a ceiling of roughly 1,800 lumens on everything this lamp can emit. Fifteen thousand lux means 15,000 lumens per square metre, so the entire output of the lamp, with nothing lost, would cover about 0.12 of a square metre — which is roughly the area of its own front panel. In other words the claim is not impossible; it is simply measured at the glass, where nobody sits. Twenty centimetres back it is a quarter of that, and at desk distance a small fraction.

It is also sold twice. ASIN B0G1SR6NPN carries the same title, the same 745 ratings and the same 4.3 average at £43.99 — seventeen pounds more for the identical product and the identical review pool. We have linked the £26.99 listing. Bought as a well-made 15 watt panel with a rotating stand it is good value; bought for 15,000 lux it is a number taken with a meter pressed against the lamp.

Credit where it is due: this listing publishes more of its own specification than most of the page. Twelve watts, 60 LEDs, four colour temperatures from 1600K to 6500K, five brightness levels from 5% to 100%, and a stated physical size. That is a genuinely useful colour range — 1600K is candlelight and 6500K is overcast daylight — and for a desk object at £32.99 with 500 ratings at 4.5 stars it is a tidy piece of design.

The disclosure works against the headline. Twelve watts is the lowest published wattage in this comparison, and at 100 to 120 lumens per watt that caps the lamp's entire output somewhere around 1,200 to 1,440 lumens. It is also the smallest lamp here, measuring 5.3 by 4.7 inches, or about 13.5 by 12 centimetres — an emitting face of roughly 160 square centimetres against the Beurer's 400. Small face plus low wattage is the combination that forces you closest to the lamp, and no distance is published for the 10,000 lux.

The other thing to note is what this actually is. With four colour temperatures spanning candlelight to daylight, a memory function and a compact footprint, it is a very good adjustable desk lamp that is also sold as light therapy. If the four temperatures are what appeal to you, that is a perfectly good reason to buy it — just do not expect a 12 watt lamp the size of a paperback to deliver clinical illuminance at arm's length.

This lamp does something no other unbranded listing here manages: it names a distance. "Kindly note keep a safe distance of more than 15cm and not look directly at the light when using." That is a safety minimum rather than the distance the 10,000 lux was measured at, so it does not solve the problem this article is about — but it is the only acknowledgement anywhere on the page that distance is a variable. At 20 watts it also has the second highest published wattage here, which is the ceiling that matters, and the 210 degree rotating head is genuinely useful for aiming light at your face rather than your keyboard.

The colour temperature labels are printed backwards. The listing offers "White Light(2800-3000K)", "Natural Light(4000-4200K)" and "Warm Light(5500-5700K)". Two thousand eight hundred kelvin is warm light — it is the colour of a filament bulb — and 5,700K is cool daylight. The first and third labels have been swapped. For a light therapy lamp this is not cosmetic: the circadian effect that light therapy relies on comes from the blue end of the spectrum, so the setting you want in the morning is the one labelled "Warm" here, and the one labelled "White" is the one to avoid.

Elsewhere the table claims an E27 bulb base and an A19 bulb shape for an integrated LED lamp with no socket in it, and the 950 gram weight is the heaviest here for one of the smaller bodies. At 4.6 stars from 374 ratings owners are happy, and at £29.99 with 20 watts behind it there is more light on offer than several lamps ranked above it. It loses ground on a small face and labels you cannot trust.

Nine hundred and fifteen ratings at 4.5 stars is the strongest evidence in this comparison, and 24 watts is the highest published wattage here, which means this lamp emits more total light than anything else on the page. It is also the nicest object: a wooden base, a 30 centimetre column, four timer settings, three colour temperatures and a remote that works from across the room. As a bedside lamp that happens to be very bright, it is easy to see why people like it.

The shape is the problem, and it is a problem no amount of wattage solves. This is a 360 degree emitter, and light therapy is measured as illuminance at the eye. A lamp that radiates in every direction is by definition sending most of its output somewhere other than your face — a column emitting evenly all round delivers only the fraction of its flux that happens to point at you. The 24 watts that ought to be an advantage over the Beurer's flat panel is spent lighting the room instead. That is a fine thing for a lamp to do. It is the wrong thing for a light therapy lamp to do.

The listing hedges the headline too. The title says "2000-10000 Lux" and the first bullet says "10,000 lux(max)", which is at least honest about being a maximum, though still with no distance. And the specification table cannot count its own LEDs: the features field says "302 Led Beads" while the Number of Lights field says 304. Two numbers, one lamp, same table.

The same geometric objection as the Caromolly above applies here, and this listing adds a second one. Its specification table gives the Power and Plug Description as "USB". USB power is bounded: a standard USB-A port supplies 2.5 watts, USB 3.0 supplies 4.5, and even USB-C at 5 volts and 3 amps tops out at 15. Whichever of those it is, it sits at or below the lowest wattage anyone else on this page publishes, and it is being asked to produce the same 10,000 lux as a 24 watt lamp. No wattage figure appears anywhere on the listing to resolve it.

Set against that, the product itself is pleasant and well reviewed. Four hundred and ninety-seven ratings at 4.4 stars, three colour temperatures from 2700K to 6000K, four brightness levels, four timer options from 10 to 90 minutes and a memory function. The oval body is 16 by 16 by 22 centimetres and looks like a designed object rather than a medical appliance, which for something you will have on a desk from October to March is worth something.

The bullets are also more careful than most: the lamp is described as delivering "up to 10,000 lux intensity", and one bullet explicitly tells you to adjust brightness "according to distance, environment and light sensitivity" — an acknowledgement that distance changes the result, from a listing that then never states one. The table rounds out the pattern with an E10 bulb base and a B10 bulb shape on an integrated LED lamp.