A bigger panel does not make a light therapy lamp brighter, but it does make it more forgiving. A large, diffused panel gives you a wider zone in which you still receive the rated light. Leaning back, turning your head or reaching for a mug does not take you out of range. That is the short answer on light therapy lamp size. The DAYARC Rise has a panel of roughly 40 × 33 cm and is rated at 10,000 lux at approximately 30–36 cm. The DAYARC Mini has a panel of roughly 23 × 13 cm and is rated at 10,000 lux at approximately 25 cm. Both reach the same figure; they differ in how much room they give you to move.
Why does the light reaching your eyes drop as you move away?
Lux is a measure of how much light is arriving at a surface, in this case your eyes. A lamp puts out a fixed amount of light. The further you sit from it, the more that light spreads out across the room, and the smaller the share that reaches you.
That is why every honest lamp specification pairs a lux figure with a distance. "10,000 lux" on its own tells you very little. "10,000 lux at approximately 30–36 cm" tells you where to sit. We cover this in what 10,000 lux actually means and how far to sit from a light therapy lamp.
Sit further back than the rated distance and you receive less than the rated figure; sit closer and you receive more. The rated distance is part of the specification, not a footnote.
What is the "sweet spot", and why does a bigger panel widen it?
The sweet spot is the region in front of the lamp where you receive something close to the rated output. With a small, intense source, it is narrow. Sit slightly to one side, tip your head down to read or lean back, and the light at your eyes drops off quickly.
A larger panel spreads the same light across a bigger surface. Light reaches you from across the whole panel rather than from one small spot. The region where you receive roughly the rated level is therefore wider from side to side and deeper from front to back. Small, ordinary movements stay inside it.
Nobody sits perfectly still for 30 minutes at a breakfast table. You reach for a mug, turn to answer someone or glance down at the paper. With a large panel, most of that happens within range. With a small panel, some of it does not.
Is a bigger SAD lamp better?
Not automatically. A bigger SAD lamp is not a brighter SAD lamp. What matters first is the lux figure at a stated distance, that the lamp is UV-free, and that the light is diffused rather than glaring. The NHS gives the same general advice: choose a UV-free lamp and follow the manufacturer's instructions.
A bigger panel wins in two everyday ways. The first is forgiving positioning, as above. The second is comfort. Spreading the same amount of light over a bigger surface means each part of the panel is less intense. Many people find that easier to sit beside than a small, concentrated source giving the same lux. It feels more like a bright window than a spotlight.
A smaller panel has real advantages too: it fits on a narrow desk, packs into a bag and costs less. The trade is that it asks a little more of you: sit at the rated distance, face it squarely and stay put.
How do DAYARC Rise and DAYARC Mini compare on size?
| Specification | DAYARC Rise | DAYARC Mini |
|---|---|---|
| Panel size | Roughly 40 × 33 cm | Roughly 23 × 13 cm |
| Rated output | 10,000 lux at approximately 30–36 cm | 10,000 lux at approximately 25 cm |
| Brightness settings | Four | One |
| Colour temperature | 4,000 K white | 3,000 K warm white |
| Positioning | Adjustable height and angle; sits on a surface or stands taller | Folding stand with a few tilt angles; portrait or landscape |
| Timer | 15, 30, 45 or 60 minutes with auto-off | None (use a phone timer) |
| Weight | Roughly 3.4 kg | Roughly 0.7 kg |
| Price | £199 | £49.99 |
The Rise panel has more than four times the area of the Mini panel. That is what buys the wider zone and the softer feel. The Mini reaches the same 10,000 lux figure by being closer to you, at approximately 25 cm rather than 30–36 cm. For a full head-to-head, including who each lamp suits, see DAYARC Rise vs DAYARC Mini.
How should you position a large panel like Rise?
- Put it where you already sit every morning: the kitchen table or your desk. A lamp you have to fetch is a lamp you stop using.
- Raise it so the panel sits slightly above eye level and tilt it towards you. Light should arrive from above and in front, the way daylight does through a window.
- Sit with your face approximately 30–36 cm from the panel. A placemat or a strip of tape on the table makes the distance easy to repeat.
- You do not need to stare at it. Eat, read or work with the panel in your field of view.
- Start on a lower setting if full output feels too bright, and let the timer end the session at 15, 30, 45 or 60 minutes.
How should you position a small panel like Mini?
- Unfold the stand, choose a tilt that points the panel at your face, and set it portrait or landscape to suit the space.
- Sit approximately 25 cm away for a 30-minute session. The manufacturer's guidance is roughly 35 cm for 60 minutes and roughly 50 cm for 120 minutes, so the further you sit, the longer you stay.
- Face it squarely rather than side-on, and use the same seat each day.
- Set a timer on your phone, because the Mini does not have one.
- It is mains powered with no battery, which is part of why it weighs roughly 0.7 kg.
Either way, the session guidance in how long to use a light therapy lamp each day applies. Panel size changes how carefully you need to sit, not how long.
Frequently asked questions
Is a bigger SAD lamp brighter?
No. Brightness at your eyes is the lux figure at a stated distance, and a small lamp can match a large one at its own rated distance. A bigger, diffused panel gives a wider usable zone and tends to feel softer, which is a different advantage.
Can a small lamp really give 10,000 lux?
Yes, at its rated distance. The DAYARC Mini is rated at 10,000 lux at approximately 25 cm. The catch is that the figure only holds at that distance and roughly head-on, so a small lamp asks you to sit closer and stay put.
How big should a light therapy lamp be?
There is no required size. Look first for 10,000 lux at a stated distance you can actually sit at, a UV-free LED panel and a good diffuser. Then choose the biggest panel that fits the place you will use it every day.
Does panel size change how long I should use it?
No. Session length depends on the lux you receive, which depends on distance, not on panel size. Twenty to thirty minutes at the rated distance is the usual starting point; a small panel simply needs you to stay in position for all of it.
Where does this leave you?
If you have a regular place at home and want positioning to be easy, the DAYARC Rise is the one with room to move. If your mornings happen at a small desk or in hotel rooms, the DAYARC Mini gives the same rated output in a panel that folds into its own cover. 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. 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 your sensitivity to light. If you think you may have depression or persistent low mood, speak to your GP. If you are in crisis, contact NHS 111, or call 999 in an emergency.