SAD Lamps in 2026: One Trial Puts Them Level With Fluoxetine, Only 46 People Test Prevention – and What to Buy Before the Clocks Go Back on 25 October
A trial that put a light box up against a course of fluoxetine found the lamp did just as well. Sixty-seven per cent of people responded in each group. That’s an odd result for a gadget that sits on a shelf next to the salt lamps and the “wellness” candles, and it’s the reason a SAD lamp is one of the few things I’d tell a sceptical friend to buy without an argument.
In This Article
- What the SAD lamp evidence actually says
- The NHS is lukewarm, and that's fair
- Buying one before the clocks change: the prevention question
- The five ways to buy the wrong lamp
- Timing and the rota nobody follows
- Why a lamp might work at all
- Who should check first
- How to make it stick through a British winter
- Where the lamp is the wrong tool
- What I'd skip while you're at it
- The short version, without a shopping list
Which is why it’s worth being fussy about what you actually buy. The clocks go back on Sunday 25 October, and the shops will be stuffed with lamps that look the part and don’t do the job.
What the SAD lamp evidence actually says
Start with the study everyone in this field ends up citing. The Can-SAD trial recruited 96 people with winter seasonal affective disorder across four Canadian cities and split them into two groups for eight weeks. One group sat in front of a 10,000 lux fluorescent light box for 30 minutes a day. The other took 20mg of fluoxetine. Response rates were identical at 67%. Remission came out at 50% for the light and 54% for the drug, which is a gap you couldn’t reliably distinguish from noise. The lamp group improved faster in the first week and reported fewer side effects such as agitation and palpitations, according to the published paper in the American Journal of Psychiatry.
Remember what that is, though. One trial. Ninety-six people. It’s a good trial, but it isn’t a verdict.
A wider review in Frontiers in Psychiatry pulled together 17 studies of bright light therapy in SAD and described response rates of about 67% in milder cases and about 40% in severe ones. That drop matters. If your winters flatten you properly, a lamp on its own is unlikely to be the whole answer, and the review treats it as something to use alongside other treatment in that case.
The NHS is lukewarm, and that’s fair
The NHS position is more cautious than the enthusiasm online. Its SAD treatment page says light therapy “isn’t usually available on the NHS” because there’s not enough evidence to tell whether it works, although it adds that many people find it helps their symptoms. It names 10,000 lux as the standard strength, says the lamp should be UV-free with a UKCA or CE mark, and warns anyone with certain eye conditions, or on medicines that make you sensitive to light, to be careful before starting. You can read the full NHS wording here.
Both things can be true. The evidence for treating a winter episode is decent. The evidence for stopping one before it starts is thin. And the NHS is mostly reacting to the second problem.
Buying one before the clocks change: the prevention question
Here’s the bit the marketing skips. Buying a lamp in October, before you feel anything, is a bet on prevention. And the best Cochrane review on that question found exactly one trial that qualified. It had 46 people in it.
Of 14 people given bright light, 43% went on to develop SAD. Among nine given nothing, the figure was 67%. Infrared light, used as a comparison, landed at 33%. The authors rated the whole thing “very low” certainty, noting the small size, the risk of bias and the self-reported outcomes, and said they couldn’t draw firm conclusions. The Cochrane review of light therapy for preventing seasonal affective disorder is worth reading in full if you want to see how little there is.
Does that mean don’t bother? No. If you’ve had SAD before, a lamp in the diary from mid-October is a low-risk, cheap-ish thing to try, and nobody has shown it does harm. But I’d stop short of calling it proven, and you shouldn’t let anyone tell you it is.
The five ways to buy the wrong lamp
This is where most people lose the benefit.
The lux number with no distance. A lamp advertised as 10,000 lux is only delivering that at a stated distance, and it drops off quickly as you move back. If the listing doesn’t say how far away you need to sit, it’s not telling you the thing you need to know. Ignore it.
The “happy light” that’s really a desk lamp. Plenty of products dress up ordinary bright LEDs in SAD branding at a fraction of the light output. Compare the lux at the distance you’ll actually sit against the NHS benchmark, not the photo of a smiling woman with a cup of tea.
No safety marks. The NHS says UV-free with a UKCA or CE mark. That’s a five-second check on the product page, and if it isn’t there, you don’t buy it.
Too small. A tiny panel means you’re sitting rigid with your face jammed towards it. You won’t keep that up for a fortnight, let alone a winter.
A dawn simulator sold as a SAD lamp. These are different products. They have their place for waking up gently, and I’d stay sceptical that they do the same job as a proper light box, since the trial evidence is built on 10,000 lux sitting in front of a bright source.
Timing and the rota nobody follows
The Frontiers review gives the standard prescription as 10,000 lux for 30 minutes, early in the morning. It also mentions lower-intensity options: 2,500 lux for two hours, or 5,000 lux for one. For most working adults the first option is the only one that fits into a morning without wrecking it.
Put the lamp where you already sit. Kitchen table, by the kettle, next to the laptop. You don’t stare into it; you glance at it now and then while you read, eat or scroll. Then leave it running for the half hour. The best lamp in the world doesn’thing in a cupboard.
And be honest about how long you’ll give it. Some people notice a change within days, and the Can-SAD data hints at that with the faster first week. Others take longer. Give it two to three weeks of near-daily use before you decide it’s a dud, and if there’s no change after that, stop spending money and talk to a GP.
Why a lamp might work at all
Nobody has a tidy answer here, and anyone who claims to is selling something. The leading idea is that bright light early in the day nudges the body clock, which in winter drifts out of step with the hours you actually have to keep. Britain makes that worse. The days are short, the sky is grey more often than not, and a lot of us commute in the dark both ways. Ordinary indoor lighting sits far below the strength used in the trials, so an office with the strip lights on doesn’t count.
It also explains why the timing advice keeps coming back to the morning. Sit in front of a bright lamp at 9pm and you may just be teaching your brain it’s still afternoon, which is the opposite of what you want if you’re already sleeping badly. Treat it as a morning tool and put it away by lunchtime.
That isn’t a settled mechanism, and I’d rather say so than dress it up. What we have is a treatment that seems to work for a fair number of people, backed by decent trials, and a partial explanation for why.
Who should check first
The NHS flags eye conditions and light-sensitising medicines, and that shouldn’t be skipped. If you take any regular prescription, read the leaflet or ask a pharmacist before you start, because some common ones do increase light sensitivity. If you have an existing eye problem, ask your optician. Both are quick conversations.
The Frontiers review also says light therapy should be matched to the type of mood disorder, which includes bipolar depression. If you have a bipolar diagnosis, don’t start bright light on your own, talk to whoever manages your care first. It’s a sensible bit of caution rather than a scare.
Headaches and eye strain are the usual complaints, and the review describes side effects as mild and short-lived. If yours aren’t, sit further back or shorten the session, then check in with a professional if it carries on.
How to make it stick through a British winter
Most lamps end up in a cupboard by mid-December, and the reason is dull: it’s a faff. So take the faff out. Plug it in before you go to bed, put it on the surface you’ll be at first thing, and attach it to something you already do without thinking, like the first coffee or the school-run emails.
Start earlier than feels necessary. If you know your low patch tends to arrive in November, starting in the last week of October means the habit is already there when you need it, not something you’re trying to build while feeling flat. That’s the practical argument for buying now, and it’s a better one than any claim about prevention.
Weekends are where it usually slips. Lie-ins, no commute, no reason to be upright. Keep the lamp going anyway, or at least keep the wake-up time within an hour or so of your weekday one, because the point is a regular signal to the body clock and a lamp used four days out of seven is a much weaker version of the treatment that was tested.
Where the lamp is the wrong tool
SAD isn’t the same thing as feeling gloomy because it’s dark at 4.30pm. The NHS says a diagnosis usually comes after depression symptoms in the same season for two years or more. The symptoms it lists are real depression ones: persistent low mood, losing interest in things you’d normally enjoy, guilt, poor concentration, sleeping and eating more than usual. If that’s you, a lamp is a decent first step, not a full answer.
If you’re having thoughts of harming yourself, put the lamp down and speak to someone today. Your GP, NHS 111, or the Samaritans on 116 123. A gadget isn’t the plan for that.
There’s an equally blunt point for the far larger group who just find winter grey. The lamp probably won’t do much for you. You may get more from getting outside at lunchtime, and fixing your sleep, than from a device. I’d also put vitamin D in the “check the dose” category rather than the miracle one, as we covered in our piece on the autumn vitamin D advice.
What I’d skip while you’re at it
Blue light glasses, for a start. We looked at 17 trials and found no help for eye strain, and I’d say the same about mood: a tinted lens in front of your eyes isn’t a substitute for bright light going in. Our blue light glasses verdict has the detail.
Sleep trackers are next on the list of things that promise a lot and give you a score. They can be accurate enough, but a number doesn’t change how you feel about November, as we found after 30 nights with a sleep ring. And if your winter tiredness is really something else, check the iron and tiredness piece before assuming the darkness is to blame.
Nor is a cold plunge the fix some people claim. If you want the cold-water side of it, we dug into the cold water swimming evidence earlier this month, and the mood data there is much thinner than for a light box.
The short version, without a shopping list
Buy one if you’ve had winter depression before, or if you’re mid-episode and want to try something with a real trial behind it. Check the lux at a stated distance, the safety marks, and the size. Use it early, for half an hour, every day, in the place you already sit. Give it three weeks.
Skip it if you simply dislike the dark and expect a lamp to fix that. Don’t pay extra for a gimmick with a nature-themed name. And see your GP if the low mood doesn’t lift, because a lamp sits alongside talking therapies and medication, it doesn’t replace them.
So here’s the question for the week before the clocks change: if you know your winter usually goes wrong around the second week of November, why are you waiting until it does to try the one thing that has a trial behind it?
