Universal dimmers automatically detect the connected load type and adapt accordingly. Trailing-edge phase dimmers for dimming incandescent lamps, HV halogen lamps and LV halogen lamps with electronic transformer.


Switch/dimming actuators

For the switching and dimming of fluorescent lamps with dimmable electronic controlgear.


Light level control

Convenience and energy saving in one – these components let you optimize your lighting.






Luminous rows



Incandescent lamp dimming

1 ... 10 V

Dimming electronic controlgear


Dimming electronic controlgear


Outdoor brightness sensors

Indoor lighting of industrial halls


Two-step control

Hall/stairway lighting

Constant light level control

Office workplace lighting

Presence control

Motion detector

Hall/stairway lighting

Presence detector

Office workplace lighting

time control

Day, week, year schedule

Shopping center after opening times

Timer mode

Hall/stairway lighting

Astro function

Car park lighting

Scene control


Ambient lighting in hotels/restaurants


Changing color LEDs for outer facade

Energy efficient lighting

Approx. 28% of all the electrical energy in a building is used for lighting. Increased demands made on the energy efficiency of buildings require enhanced optimization of energy supply, distribution and use. This goal can only be achieved through automation. Useful automation takes into account the comfort requirements of room users so that room temperature and the level of lighting can be optimally adjusted to the current usage situation. Room users need to be able to adjust their work environment to suit individual requirements.

Savings potential demonstrated using an office building

To reduce energy costs, the artificial lighting of a room can be controlled dependent on time, occupancy and daylight. A range of solutions are available for this purpose, which we shall describe in the following sections and consider their effectiveness with regard to reducing energy costs.

By way of an example, we will demonstrate potential energy savings in an office. In the case of lighting that is not automated, a user profile can be assumed, which is demonstrated in the diagram "Options for potential savings. It is assumed that minimum lighting is switched on at 7 am. From 8 am onwards, the lighting is switched on fully by room users. The lighting is then left on all day until the last person leaves the room and switches off the light. Minimum lighting is often left running for cleaning purposes (for example). This lighting is then switched off, either by the cleaners or by security.

Potential savings - the gray areas of the diagram represent the energy used in the case of manual light control.

Time-dependent light control

When lighting is switched on by persons entering a room due to the level of lighting, in many cases they forget to switch it off again on leaving. A time-dependent light control would take this into account. Time-dependent light control is either relative in relation to an event or absolute in relation to a time or date. If the time-dependent light control is relative to an event, the lighting is switched off on expiry of a set time or dimmed to a minimum value. The best known example of this type of light control is stairwell lighting control.

In the event of time-dependent light control, the lighting is automatically switched off at a preset time. In order to warn users of an impending off, the lighting can be set to flash prior to the action or, depending on the equipment, dimmed to a preset value. This gives users the opportunity to delay the switch off by a set time, e.g. 60 minutes, by overriding it manually.

The diagram "Potential savings quantified" shows the effect of time-dependent light control on energy consumption.

By switching off lighting centrally, energy consumption can be reduced by 18%.

Daylight-dependent light control

There are generally two methods for the daylight-dependent control of the brightness in a room: light control over a brightness sensor in the room (constant light level control) or light control over an outdoor brightness sensor in combination with control devices, which take into account the direction of the window, the geometry of the window and the possibility of objects that may throw shadows (buildings, trees).

There are arguments in favor of both methods. While the daylight-dependent light control requires fewer sensors than other light controls, commissioning involves considerably higher engineering costs. The level of lighting can be kept at a preset or user-defined value by a constant light level control in a way that optimally utilizes the available daylight and reduces energy costs. In order to utilize the daylight and offer anti-glare protection, the slats of the relevant shutter/blinds can be controlled so that these permit the penetration of available daylight while preventing the glare of direct sunlight. By preventing direct sunlight from penetrating the room also prevents the room from becoming too hot.

Presence-dependent light control

Many rooms are only used for part of the day so that a presence-dependent daylight control system could be usefully implemented to reduce energy costs.

Using presence detectors, room functions can be automatically switched from comfort mode to ready-to-run or energy-saving mode. They can also be used in combination with an access control or controlled manually or over a preset time. In corridors the lighting can be switched off outside the main periods of use and only switched back on when the presence of persons is detected. Within the main periods of use, the lighting can also be dimmed to a minimum brightness level if there are no persons present. This achieves optimum energy savings and extends the service life of lighting.

If operation of the corridor lighting is presence-dependent, the right level of lighting is always delivered as and when required. And energy consumption is in keeping with actual requirements. This also applies to outdoor and path lighting that switches on depending on brightness, movement and time - and is therefore always on when required.

The image "Potential savings quantified" shows the effect of presence-dependent light control on energy consumption during the day.

Potential savings quantified

The reduction in energy costs achieved by using light controls that are time, daylight and occupancy-dependent is approx. 44%.

Cost efficiency

The cost-effectiveness can also be expressed in the time it takes to recoup the investment made in the savings method used. Our example allows the calculation of a payback period of 3.3 years if using a light control system with KNX components.


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Festo Norgren Schneider Electric Siemens