For public areas, designing an energy saving switch should meet these factors:

Manual lights on
Manual Lights On

Should be convenient for the user to turn the lights on as needed, and not have it turned on automatically when not needed.

Lights left on
Forgetting to Turn Lights Off

Should be able to have the lights turn off automatically when the occupant leaves and forgets.

Lights frequent on/off
Wear & Tear from Frequent Operation

Should avoid cycling the lights too frequently which inflicts wears down both the luminaire and the relays controlling it. Resulting in more frequent maintenance and net loss.

Conventional Shortcomings

IR sensors are used as the most common form of energy saving, but they suffer from several shortcomings:
Wear & tear from frequent on/off
Wear & Tear from Frequent On/Off
  • Using sensors results in much too frequent operation of the lights, and results in greater wear and tear on the both the luminaires and shortens their lifespan. This is especially true for highly trafficked areas such as corridors, restrooms and elevator lobbies.
  • For LED and compact fluorescent lamps especially; their large inrush currents harms the relays used and makes them fail much sooner.
Inadvertent On
Inadvertent On

The lights will turn on inadvertently at the slightest movement even if the person is just passing through the area, resulting in unnecessary wasted energy.

  1. The user cannot turn on lights deliberately because they are constrained by whatever conditions are imposed on the sensors before turning on.
  2. The user can no longer manually turn the lights off when needed because the sensor keeps triggering to keep the lights on.


These two types of smart energy saving switches are simple yet practical, they meet the need for manual on and auto off control, totalling avoiding he problem of forgetting to turn the lights off when leaving.

A unique feature of these devices is that they combine wall switches with the sensors into one solution.



The K15 is a ceiling mounted sensor for use in large spaces and which could also be integrated into our lighting control system.



The K24 is wall mounted and suited for small discrete rooms.


Operating Modes

  1. Occupancy Mode: People come, lights auto on; people leave, lights auto off.
  2. Vacancy Mode: Lights turned on manually; on leaving, lights can either be turned off manually or if the occupant forgets it will turn off automatically.
  3. Steady On: For special events, the lights are kept on indefinitely until manually turned off.

Unique Features

  1. Lux sensitivity adjustment
  2. Adjustable delay off time
  3. Dry contact output
  4. Selectable occupancy or vacancy mode
  5. AC powered, no separate power supply needed.

(1) Vacancy Mode

Vacancy Mode: Typically used in places where people stay for long; e.g. reception lobby, office, work area, classrooms, libraries, labs, etc.

  • Room Occupied: The occupant can control the lights manually anytime.
  • Occupant Leaves: If the occupant forgets to turn off the lights, the sensors will automatically do it in their stead.
佔空模式 2
  • When a occupant only needs to get something or is just passing through, they don't want to turn on the lights.
  • When the brightness is sufficient, the occupant doesn't need to turn on the lights
佔空模式 3
  • When the occupant is just resting or watching a projection, they will want to dim the room and manually turn off the lights.

(2) Occupancy Mode

Occupancy Mode: Commonly used for trafficked areas where people don't stay for long; e.g. restrooms, elevator lobbies, hallways, kitchenettes

Occupancy Mode 1
  • When the brightness is sufficient, the sensor will detect the occupants presence but will not turn on the lights.
  • When the brightness is insufficient, the sensor will turn the lights on when there is an occupant and turn it off once the occupant leaves.
Occupancy Mode 2
Method of Operation:
  • Lights On: Upon entry, the lights will turn on automatically.
  • Lights Off:Upon leaving, although the lights will turn off automatically, it can also be turned off manually.

(3) Auto Mode

Auto Mode

Typically Used In: storerooms, data centers

Method of Operation: auto on, auto off

Note: The occupant may stay for either a short or long time, these two situations require two different delay periods. The K24 has the capability to sense these two different situations and automatically determine the right delay time to use.

(4) Steady Mode

Steady Mode

Steady Mode: Under occupancy mode, when there is a need for the occupant to stay for long, they can do a long press to force the lights to go into steady mode and ignore the sensor (applies only to the K15).


  1. In a storeroom or data center, most of the time the occupant only stays for a short time, but there are times when there is a need to stay for a long time and wouldn't want the sensor to turn off the lights at an inopportune time.
  2. During these situations, the occupant can do a long button press to force the lights to go to steady mode and remain on.


K24 front
  • The K24 is wall mounted. It combines the sensor and switch into one enclosure. The lux sensor threshold can be adjusted.
K24 rear controls
  • Operation: occupancy, vacancy and auto modes can be selected from the DIP switches.
K24 wiring
Two types of power source:
  • The L/G type requires the live wire and any grounding; it is suited for existing installation retrofits.
  • The L/N type requires the live wire and the neutral wire; it is best used for new installations.
  • Power supply can make use of either 120, 220 or 277V.

K24 Demo


  • The K15 is a ceiling mounted sensor, it is equipped with an adjustable sensitivity lux sensor, and can be connected to a button switch.

Operating Modes:

  • Occupancy and vacancy modes, which can be selected through the DIP switches.
  • Steady Mode: While in occupancy mode, if there is a need to work long term, then a long button press can activate steady mode and the lights will remain on indefinitely and will not be affected by the sensor.
  • Output: Supports both ac output for connecting with the lights and also a dry contact output.
  • Wide voltage range, can be used with 120/220/277V.

K15 Demo