Yes: through the darker months, most people who use a SAD lamp use it every day, at about the same time each morning, and pause once they are waking in daylight, which in the UK is usually from around the middle of April. Missing the odd day is not a problem; a routine you keep most mornings matters more than a perfect record. If you are asking "should I use a SAD lamp every day?", the short answer is yes in winter, probably not in summer, and never late in the evening.
Why does daily use matter more than any single session?
Your circadian rhythm is the roughly 24-hour cycle that governs when you feel sleepy and alert. It is reset a little each day by light reaching the eyes, and it drifts later when mornings are dark. A bright-light lamp is used in the morning to give that daily reset something to work with.
Because the reset happens every day, the effect of a session does not build up in a bank; bright light on Monday does not carry you through to Thursday. That is why the commonly recommended pattern is a session soon after waking on most days, rather than a long session now and then.
What does "every day" look like in practice?
For most people it is 20–30 minutes at the breakfast table or a desk, within an hour or so of waking, with the lamp at its rated distance and slightly above eye level. Our guide to how long to use a light therapy lamp each day covers session length. The points below are about repeating it.
- Same spot. A lamp that lives on the kitchen table gets used. A lamp in a cupboard does not.
- Same distance. DAYARC Rise is manufacturer-rated at 10,000 lux at approximately 30–36 cm. DAYARC Mini is rated at 10,000 lux at approximately 25 cm, with manufacturer guidance of about 25 cm for a 30-minute session and roughly 35 cm for 60 minutes. Lux is a measure of how much light reaches a surface, and a lamp only delivers its rated figure at its rated distance.
- Same length. Rise has a built-in timer with 15, 30, 45 or 60 minute settings and auto-off, so the session ends itself. Mini has no timer; a phone timer works fine.
- Same time. Soon after waking, not at lunchtime and not in the evening.
The NHS advises choosing a UV-free lamp and following the manufacturer's instructions; both DAYARC lamps are UV-free.
What if you miss a day, or a week?
Nothing dramatic. Without its morning light the body clock starts to drift later again, and after a long gap mornings may feel heavier. Restart at the usual time and length.
Do not double the session to make up for lost days, and do not use the lamp in the evening because you missed the morning: evening bright light tends to push the body clock later, the opposite of what a morning routine is for. Long sessions are also where people run into headaches, eye strain or feeling wired; we cover those in light therapy lamp side effects.
A week away in winter is the most common reason for a gap. Mini folds into its own stand and weighs roughly 0.7 kg, so some people pack it; others pick the routine up again when they get home.
Should you use a SAD lamp every day in summer?
Most people do not. By mid-April sunrise is around 6am across the UK, and before 6am everywhere by the end of the month, so anyone waking at a normal hour is waking in daylight. Daylight outdoors is far brighter than any lamp: an overcast day is roughly 1,000–5,000 lux and bright summer sunshine 50,000–100,000 lux, against a lamp's 10,000 lux at its rated distance. Ten minutes outside on a light morning does more than a panel indoors.
The usual pattern is to let the lamp fade out of the routine in spring and put it away for summer. Some people carry on, for sensible reasons.
- You wake very early. If you are up at 4.30am for work, sunrise is still ahead of you for much of the year.
- You are indoors all morning. A bright office is around 300–500 lux. If you go from bed to car to desk, you may see little daylight before midday.
- You work shifts. Shift patterns do not follow the sun. We cover timing in light therapy for shift workers.
If none of those apply, there is nothing wrong with a summer session, but for most people there is little point.
How do you wind down in spring and start again in autumn?
There is no need to taper. Many people skip the lamp on a bright morning and find a few weeks later that it has not been switched on. If you would rather be deliberate, use sunrise as the cue: once the sun is up before you are on most days, the lamp has done its job for the year.
Starting again is the more important end. When you are waking in the dark again, usually during October, bring the lamp back to the table. We go through the dates month by month in when to start using a light therapy lamp in the UK. The table below uses London sunrise times; Edinburgh runs roughly 15 to 40 minutes later through the winter.
| Season | Mornings in London | Typical use |
|---|---|---|
| Early autumn (September to mid-October) | Sunrise 07:01 on 1 October; most people still wake in daylight | Many start on the first mornings they wake in the dark |
| Late autumn (late October and November) | Clocks go back on Sunday 25 October 2026: sunrise 06:41 that morning, but sunset 16:46; by 15 November sunrise is 07:18 and sunset 16:10 | Daily morning sessions |
| Winter (December to February) | Latest sunrise about 08:06 around 30 December (08:44 in Edinburgh); still 07:39 on 1 February | Daily morning sessions |
| Spring (March to mid-April) | Sunrise 06:46 on 1 March; clocks go forward on Sunday 28 March 2027 | Wind down as you begin waking in daylight |
| Summer (mid-April to August) | Sunrise around 6am by mid-April and before 6am everywhere by late April | Most people pause; early risers, indoor workers and shift workers may continue |
Frequently asked questions
Can you use a SAD lamp too much?
More is not better. Sessions much longer than the manufacturer recommends are where people tend to report headaches, eye strain, feeling wired or disturbed sleep. If that happens, shorten the session, sit slightly further back, or on Rise drop to a lower brightness setting.
Should I use my SAD lamp at weekends?
Yes. If you lie in, use the lamp when you get up rather than skipping it. A big swing in timing between weekdays and weekends is what leaves many people feeling flat on a Monday.
Can I use a SAD lamp twice a day?
No need. A second session in the late afternoon or evening can push your body clock later and interfere with sleep; one session soon after waking is the pattern the lamps are designed around.
Do I need a light therapy lamp in summer?
Most people do not. Once you wake in daylight, a few minutes outside does more than any lamp. The exceptions are very early starts, mornings entirely indoors, and shift work.
Where does this leave you?
If you want a lamp that lives in one place and makes a daily routine easy to repeat, DAYARC Rise (£199) has a large panel, four brightness settings and a built-in timer. If your mornings happen in a small flat, at a shared desk or away from home, DAYARC Mini (£49.99) folds into its own stand and goes where you go. Our comparison page puts the two side by side.
About DAYARC
DAYARC is a new UK circadian rhythm startup. We make two bright-light lamps for the morning: DAYARC Rise (£199), a full-size lamp rated at 10,000 lux at approximately 30–36 cm, with four brightness settings, a 15 to 60-minute timer and adjustable height and angle; and DAYARC Mini (£49.99), a compact lamp rated at 10,000 lux at approximately 25 cm, with a folding stand that doubles as its cover. Both use UV-free LEDs and run from the mains. We publish plain specifications with the measuring distance, we do not make medical claims, and we write the DAYARC Journal to help people build a simple morning light routine around their own daily rhythm. Both lamps are in stock in the UK and dispatched within 2 working days. You can read more about how we think on our approach page or compare the two lamps.
This article is general information, not medical advice. Light therapy is not usually available on the NHS because there is not enough evidence to tell whether it is effective. Check with a GP or qualified healthcare professional before using bright light if you have an eye condition, a condition affected by bright light (for example bipolar disorder), or take medicines that increase sensitivity to light. If you have persistent low mood, speak to your GP. If you or someone else is in crisis, contact NHS 111, or call 999 in an emergency.