Technical information

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Dimming
LED DALI Control
Luminaires with automatic or programmable
control
LEDs are available as light sources in various colours. The first, and
most usual, colour of an LED is red. It is normally combined with
green and blue, and in special cases also yellow (to create a warmer,
white light). The term RGB control is normally used for LEDs in the
colours red, green and blue. By mixing and combining the three
colours in various strengths, it is possible to create around 65,000
dierent colours. To create your own colours, some form of control
unit or interface is required to a piece of software that communi-
cates via DALI or DMX512.
A luminaire such as Pozzo with RGB control and a DALI interface
is also supplied with automatic sequence control. When the power
is connected to the luminaire’s LED module, the sequence starts
immediately. Pozzo has separate connections for fluorescent lamps
and LEDs. Using two switches, this allows you to choose between
normal fluorescent lighting or RGB control. If the fluorescent lamp
is switched on, the dierent light intensity means the RGB control
is barely noticeable. If a number of luminaires with automatic se-
quence control are located in the same room, after a while you will
notice a dierence between the various sequences as the colours
will be out of step when changing.
Programmable RGB control
If the interface module in the Pozzo is connected to a DALI system
with an external power supply and software, the automatic se-
quence control will cease. The three channels for red, green and blue
will then function as standard DALI loads.
Each colour will become a DALI address, so 10 RGB controls will
acquire 30 DALI addresses. Control can be handled in dierent ways.
A DALI SQM can control all units if you wish to continue with auto-
matic sequence control.
For manual control in fixed scenes after programming, a push-
button panel can be used, for example a DALI Touch panel with 4
scenes and O function. For advanced control, a DALI router can be
used to control all imaginable functions.
Time
%
Pozzo
Pozzo
Pozzo
DALI
DALI
PSU
DALI
interface
DALI
Panel
DALI
SQM
DALI
Router
Example of automatic RGB sequence.
A PC, with the required software, is used for programming.
When an RGB luminaire is powered up, the colour changes of the sequence control
start automatically. If a particular colour is required, the luminaire or luminaires in a
room can be programmed to show the desired colour or all change simultaneously.
It is also possible to create various light scenes selected using a panel.
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