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Lighting Controls
Energy Efficient Lighting Controls
In a world where cost-saving gives competitive advantage, where Corporate-Social-Responsibility is central to your
company’s brand-image, and where legislative compliance is crucial, deployment of lighting control systems answers
these three challenges. Conservation of energy from automated controls can reduce lighting-related energy
consumption by up to 60%. With a range of sophisticated products that enable immediate energy savings and simple
operation, Havells-Sylvania offers a complete end-to-end solution for lighting. From daylight-harvesting and digital
dimming to emergency-testing and energy-use reporting, a bespoke system using DALI and Ethernet networks can be
expanded from single rooms and corridors to complete building-wide control, optimising building running costs whilst
maintaining comfort and safety. Control systems can also improve the simplicity of operation of lighting installations,
automating regular switching patterns, regulating light levels and allowing entire floors or buildings to change from
‘daytime’ to ‘night-time’ illumination settings at the press of a single button.
Havells-Sylvania is able to arrange the planning and commissioning of a broad range of control systems tailored to
meet the requirements of each specific installation from a simple luminaire including daylight linking to sophisticated
PC controlled systems incorporating hundreds or thousands of luminaires. A brief summary of control principals and
technologies follows, for further information on the range of control systems available please contact our sales office
or your local sales representative.
Types of control
On/off switching
s ,OCAL SWITCH CONTROL
Lighting control at its most basic - the use of a local
switch plate to turn light luminaire on and off as
required.
s /CCUPANCY SENSING
Presence detection: lights on automatically when
motion is detected. Lights off automatically when area is
unoccupied for a period of time.
Absence detection: lights switched on manually by the
user, lights off automatically.
PIR sensor: detects the movement of a warm body.
Microwave sensor: detects any small movement over a
larger area.
s 4IMED CONTROL
Automates the switching on and off of luminaires during
the day i.e. to ensure that all (or selected) luminaires are
switched off at times when the building, or areas within
THE BUILDING WILL BE UNOCCUPIED 4HESE TIMED EVENTS CAN
also be based on an astronomical clock, allowing the
automated times to be offset to sunrise and sunset.
Switch Dim
A variety of different systems are available, but all work
using mains voltage as a control signal. Depending on
how long a conventional push-to-make switch is held
down the ballast can interpret the signal either as a
dimming or switching command.
Allows fittings to be dimmed through the use of a local
switch plate, providing a greater degree of control to
the occupants of the space.
DSI
With this system both on/off and 1% - 100% power
regulation are achieved by means of a digital signal
broadcast to all of the ballasts on a control circuit
(loop). Control requires the use of more sophisticated
equipment. Control is usually achieved through the use
of more sophisticated switch plates or remote control
devices to recall and adjust desired dimming levels.
4HE DIMMING CURVE USED IN $3) BALLASTS ENSURES THAT
changes in light level are friendlier to the human eye
when compared to the traditional 1-10V ballast. With
DSI there is the potential for a maximum of 100 ballasts
per loop.
Daylight Harvesting Systems
Uses photocells to maintain an approximate illumination
level within an area by either switching or dimming
luminaires as the amount of daylight within an area
increases or decreases.
1-10V Analogue
Analogue ballasts incorporate a dimming circuit
which regulates the lamp power - typically between
10-100% depending on lamp or luminaire type,
normally controlled through either a linear or rotary
POTENTIOMETER DIMMER /N /FF CONTROL REQUIRES A
SEPARATE /N /FF MAINS SWITCH WITHIN THE CIRCUIT
Regulation parameters:
s .O SIGNAL CONNECTION FULL OUTPUT
s 6 FULL OUTPUT
s 6 MINIMUM OUTPUT
Changes in light level tend to have a non-linear
appearance to the human eye when the dimming is
ADJUSTED 4HE MAXIMUM NUMBER OF BALLASTS ON A CIRCUIT IS
dependent upon the total control circuit current and the
potentiometer capacity. Any change to the system may
require the system to be re-wired.
DALI - Digital Addressable Lighting Interface
DALI ballasts provide both power regulation and on/
off switching along with a degree of local intelligence
within each ballast, reducing the complexity of the
control system. In a DALI system each ballast on a loop
can be individually addressed and controlled, providing
potential to greatly reduce the wiring complexity and
allowing changes to the system to be achieved by
simply reprogramming the ballasts. Each DALI loop
can accommodate a maximum of 64 ballasts and each
ballast can be allocated to up to 16 control groups. A
maximum of 16 pre-programmed scenes levels can also
be programmed into each ballast, for easy recall by the
control system.
Additionally DALI can provide:
s &UNCTION CHECKS OF BALLASTS AND LAMPS IN EACH LUMINAIRE
from a central position.
s 3TORAGE OF PRE
PROGRAMMED INFORMATION IN THE BALLAST
(e.g. pre-set illumination levels of fixture grouping).
Changes in light level tend to have a linear appearance
when the dimmer is adjusted.
-30% -50% -60% -75%
+30%
FIXED OUTPUT
MANUAL
DIMMING
PIR + MANUAL
DIMMING
DAYLIGHT LINKED
DIMMING
DAYLIGHT LINKED
+ PIR + MANUAL
DIMMING
HF Ballast
Dimmable
HF Ballast
Dimmable
HF Ballast
Dimmable
HF Ballast
Dimmable
HF Ballast
Presence detection
Absence detection
Passive InfraRed sensor
Microwave sensor