The first two weeks with a SAD lamp are mostly about building the habit: a fixed place, a fixed distance and a fixed time within an hour of waking. Some people notice brighter-feeling mornings within days, which is the body clock responding to a regular light signal; any change in mood, where it happens, is measured in weeks in the research, and many people notice nothing dramatic at all. Here is what a realistic fortnight looks like, and the small adjustments that make the difference between a fair trial and a lamp in a cupboard.
Before day one: three decisions
Where the lamp lives, how far away you sit and what time you use it. The research protocol is 10,000 lux at the lamp's stated distance for 20 to 30 minutes soon after waking. DAYARC Rise is rated at approximately 30–36 cm and DAYARC Mini at approximately 25 cm; the panel goes slightly above eye level and a little to one side, so you can eat or read with the light in view without staring at it. Most people settle on the kitchen table or a desk. Where to put a SAD lamp at home and how far to sit cover the choices; the NHS advises choosing a UV-free lamp, following the manufacturer's instructions and speaking to a GP first if you have an eye condition or take medicines that increase light sensitivity.
Days 1 to 3: getting used to it
The first session usually feels very bright; that passes within a few days as your eyes adjust and you stop looking directly at the panel. Start at 15 to 20 minutes rather than 30, and if the lamp has brightness settings, start one step down. A mild headache or eye strain in the first days is the most common complaint and nearly always means too close or too bright; move the lamp back a hand's width or shorten the session. Some people feel a bit wired the first morning or two. Light therapy lamp side effects explains what is normal and how to adjust.
Days 4 to 7: the routine settles
By the end of the first week the session should be an ordinary part of breakfast rather than an event. This is the point to move up to the full 20 to 30 minutes at the rated distance if you started lower. Keep the wake time the same seven days a week, including the weekend, because the lamp is only half of the signal; a Sunday lie-in undoes the earlier mornings, as weekend lie-ins and social jet lag explains. If you notice anything at this stage it is usually that the alarm feels slightly less brutal, which is consistent with the body clock beginning to shift earlier.
Days 8 to 14: judging it fairly
The second week is where a note helps. Rate three things each morning out of five, how easily you woke, how alert you felt an hour later, and your mood, and write them down; memory is a poor judge of gradual change. Do not change anything else at the same time. By day 14 you will have a fortnight of consistent mornings, which is the minimum the research would consider a trial, and most trials ran for two to six weeks. Do SAD lamps work? sets out what those trials found: a modest average benefit for seasonal affective disorder, with wide variation from person to person.
| Stage | Session | What to watch |
|---|---|---|
| Days 1–3 | 15–20 minutes, one setting down if available, rated distance | Glare, headache, eye strain: move back or shorten |
| Days 4–7 | 20–30 minutes at the rated distance | Same wake time every day, including the weekend |
| Days 8–14 | 20–30 minutes, same time, same place | Keep a daily note of waking, alertness and mood |
| Weeks 3–6 | Continue | Review the notes; stop and see a GP if you feel worse |
What should you not expect?
A jolt. Bright light has an alerting effect that is well documented at night and less consistent during the day, as do SAD lamps help with tiredness? explains, so the session itself may not feel like anything. A cure for low mood: the NHS lists talking therapies and antidepressants as the treatments for seasonal affective disorder and says light therapy is not usually available on the NHS because the evidence is not strong enough. And results from missed days: the trials measured daily use, and a session three times a week is a different, weaker thing.
When should you stop or seek advice?
If side effects do not settle with the adjustments above, stop and speak to a pharmacist or GP. If your mood is low for more than a couple of weeks, or you feel worse, see your GP whatever the lamp is doing; winter low mood: when to see your GP explains what help is available. Anyone with bipolar disorder or a related condition should not start bright light without medical advice, because bright light can affect mood in the other direction.
Frequently asked questions
Can I use it while working at a laptop?
Yes, provided the lamp is at the rated distance and above the screen line rather than behind it. Many people find breakfast and the news easier than work for the first week.
What if I miss the morning?
Skip the day. An evening session pushes the body clock later and can disturb sleep; the best time of day to use a light therapy lamp explains why the first hour after waking is the window.
Should I keep going after two weeks if I feel no different?
Give it four to six weeks of consistent use before deciding, as the trials did, and look at your notes rather than your impression. If nothing has changed by then, it may simply not be for you.
Is it safe to use every day?
Daily morning use at the rated distance is what the research used, and early trials reported no eye changes over two to six weeks; are SAD lamps safe? covers UV, eyes and who should check first.
Where does this leave you?
With a fortnight that builds a habit rather than promising a miracle: a fixed place, the rated distance, a fixed time within an hour of waking, seven days a week, and a note each morning. Give it the weeks the research gave it. If you are choosing a lamp, how to choose a SAD lamp in the UK lists what to look for, and the choose your light page compares DAYARC Rise and Mini.
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. 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. Check with a GP or qualified healthcare professional before using bright light if you have an eye condition, a condition affected by bright light such as bipolar disorder, or take medicines that increase your sensitivity to light. If you have persistent low mood or think you may have depression, speak to your GP. If you need urgent help, contact NHS 111, or call 999 in an emergency.
Sources
- NHS: Seasonal affective disorder (SAD)
- Terman J. S. et al. (1990). Efficacy of brief, intense light exposure for treatment of winter depression. Psychopharmacology Bulletin, 26(1), 3–11
- Lok R. et al. (2018). Light, alertness, and alerting effects of white light: a literature overview. Journal of Biological Rhythms, 33(6), 589–601