A desk is rarely occupied without interruption. A reader sits down, gets up to find a book and later returns to the same page. A lamp's controls become part of that routine: switching the light on, choosing a setting and switching it off when the activity ends.
Presence sensing and setting memory address different parts of this experience. One responds to someone arriving or leaving. The other recalls a setting already chosen. The Zhexian ZX-TC1 desk lamp brings both functions into its everyday controls, while the ZX-F0281 floor lamp provides another example of a documented response to absence.
Two controls with different jobs
An occupancy control changes the light's operating state in response to activity in a space. Setting memory concerns the light's selected configuration when it is switched on again. These are separate functions, even when they appear in the same lamp.
The U.S. General Services Administration's lighting overview describes occupancy sensors that turn lights on when a space is occupied and off when it is unoccupied. It distinguishes these from photosensors, which respond to available daylight.
That distinction explains why the word “automatic” can describe several experiences. A lamp that responds to presence, a lamp that restores its previous setting and a lamp that adjusts to daylight each follows a different control logic.
ZX-TC1: a response to sitting down and leaving
The ZX-TC1 desk lamp has a seat sensor described in its original specifications as switching the luminaire on when the user sits down and off after they leave. The switching action follows use of the desk.
The head-mounted control panel provides a separate way to select the light setting. Reading and Comfort are the two listed modes, with nominal white-light settings of 4000 K and 2700 K respectively. Both have five brightness steps. These are named settings; the datasheet records measured sample colour temperatures separately.
The combination gives the product two everyday roles: the sensor handles the documented sitting-and-leaving response, while the panel gives the user control of mode and brightness. The TC1 documentation does not state a numerical switch-off delay, so this description does not assign one.
Remembering a setting rather than choosing a new one
ZX-TC1 also remembers the last setting used and restores it when the luminaire is switched on again. This gives the user a familiar starting point on returning to the lamp.
For example, a reader may select a mode and brightness level during a session. Setting memory concerns recalling that previous selection; it does not mean the lamp assesses the book, identifies the task or decides which brightness is best.
The remembered setting is therefore a useful companion to the physical controls. The user can return to it or make a new selection as the activity changes. The original ZX-TC1 specifications describe the five-step adjustment, two modes, seat sensor and memory together.
ZX-F0281: a timed departure sequence
The ZX-F0281 floor lamp uses a radar presence sensor. Its specifications describe automatic switch-on when the user arrives, followed by a defined sequence after absence: the light fades down after 10 minutes and switches off one minute later.
Here, leaving and switching off are separated by a documented interval. That timing belongs to ZX-F0281; it is not a shared specification for every Zhexian sensor-equipped lamp. The original TC1 description gives its switching behaviour without the same timing detail.
These examples show how control design can shape small, repeated interactions with a lamp. Presence response addresses arrival and departure; TC1's setting memory recalls a previous choice. Their appeal lies in those practical actions alongside the controls the user operates directly.
To discuss ZX-TC1 or ZX-F0281 for a lighting range or workspace application, contact Zhexian about these models.