L1 · Barely there
Rung L1: Barely there
L1 is the rung nobody chooses deliberately and everybody ends up wanting. It reads only within arm's reach, only in a quiet room, and it is the only band where the most common failure is not too little but too much.
By The Scent Desk·Published 2026-08-24
| Covers | 1–5 m2 |
|---|---|
| Readable at | 0.3–0.8 m |
| What it claims | Readable only within arm's reach, and only when the room is already quiet. |
| Where it applies | 1-5 m2 of treated surface or enclosed volume; one sachet, one small plaque, two sprays on a cushion. |
| Typical rooms | Wardrobe, car cabin, bedside, a single drawer bank, the towel zone of a small bathroom. |
| Air exchange | Designed for closed volumes. In a draughty room L1 disappears entirely within twenty minutes, so treat airflow as a hard ceiling rather than a modifier. |
What you should notice
- You cannot smell it standing in the doorway — correct for L1, not a fault.
- It reads as strong when you put your face next to it — also correct. L1 is a proximity rung.
- Guests cannot tell the room is scented — the intended outcome.
How to adjust it
Raise output only by adding a second carrier of the same direction in the same enclosed volume. Moving an L1 carrier into an open room does not make it an L2; it makes it a smaller L1.
If it overshoots — Two carriers in one 2 m2 wardrobe. Lift one out and leave the door open for an hour.
If it reads sharp — A single drop of neat oil landed on the filler. Replace the filler; there is no way to dilute it in place.
L1 is defined by distance, not by concentration
The rungs are defined by how a room reads, and L1's criterion is a detection distance of 0.3 to 0.8 m. Its absolute concentration cannot be discussed without the distance attached. The same bottle reads as L1 at 30 cm and as L2 or L3 at three metres. L1 is not "a very small amount of fragrance"; it is "fragrance that works at very close range".
That also explains why moving an L1 carrier into a large room does not make it an L2. It makes it an L1 that reaches nobody.
Working volume: 1 to 5 square metres
The typical L1 settings are sealed small volumes — a wardrobe, a car cabin, a bedside shelf, a single drawer, and the towel zone of a small bathroom. What they share is that a person is very close to the carrier, and the volume is small enough that diffusion never enters the picture.
In that kind of space, concentration is the ratio of release to volume and almost nothing else. The configuration logic is therefore completely different from an open room: do not think about coverage area at all, think only about whether the read is right at the moment of contact.
Airflow is a ceiling, not a modifier
The weakness of L1 is draught. In a room with through-ventilation, an L1 release is stripped out completely within twenty minutes. It does not become faint; it disappears.
This is why the L1 handbook has no entry for "increase ventilation to drop a rung". If a room ventilates often, go to L2 rather than doubling L1 — a doubled L1 in a draughty room still reads as nothing from a metre away.
Three failure signs and what to do about them
| Sign | Cause | Adjustment |
|---|---|---|
| Nothing at all | Too far away, or sitting in the airflow path | Move within 0.5 m; clear the doorway and the window gap |
| Overpowering when the doors or car open | Dose set by room area rather than by distance | Drop the load by 10-20%, or remove a carrier |
| Only detectable up close, and sharp when you get there | A local concentration point, usually a carrier that is enclosed | Free the carrier so more of its surface is exposed |
The second and third signs look contradictory and are frequently present together: nothing at room level, sharp at close range. That combination is the signature of a high local concentration with poor spread, and the fix is more release area — a sachet taken out of its pouch, a plaque stood on edge — rather than more oil.
The test for moving up a rung
To promote an L1 setting to L2, the only test that works is conducted from outside. Stand outside the wardrobe, or outside the car with the door shut, wait ten minutes, then open it. If you can smell it clearly in the first second, it is already at L2.
Never judge from inside the space. Habituation inside a small volume takes about thirty seconds, and any judgement made from in there will read one to two rungs low.
Failure diagnosis
| What you notice | What caused it | What to change |
|---|---|---|
| Nothing at all, even with your head inside the wardrobe | The filler has gone flat, or the pouch is lying flat against the wood and half its surface is doing nothing | Squeeze or re-oil the filler and stand the pouch side-on. A flat pouch in a sealed volume loses about a third of its output. |
| It reads while you are still in the doorway | Too many units for a 1-5 m2 volume. Two carriers in one wardrobe is the usual version of this. | Take one unit out and leave the door open for an hour. Judge again the next day, not the same evening. |
| A sharp patch right beside the carrier | Neat oil has landed on the filler, or something is being held within the near field | Replace the filler. Nothing dilutes in place, and moving an L1 carrier into an open room does not fix a concentration problem. |
Plans published at this rung
| Rooms | Carrier | One fill lasts | Running cost |
|---|---|---|---|
| Entryway | Reed diffuser | 32 d | CNY 21 |
| Wardrobe | Scent sachet | 52 d | CNY 13 |
| Car | Scent plaque | 41 d | CNY 12 |
This record went live on 2026-08-24. Records dated later in the register are not listed anywhere on the site until their date arrives.