DALI LAMP: Digital
Addressable Lighting Interface LAMP.
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THE DALI PROTOCOL
Why should I use a DALI system instead of products based on a proprietary
DALI is an open standard that provides assurance of interchangeability across
vendors, enables sharing of advanced product features across manufacturers, puts
the designer in a position of gaining lower costs through competition, and
assures future availability.
Is it true that DALI dimming systems are specifically geared to large
Digital lighting control systems are suitable for small, medium and large
projects. The simplest of systems consists of a 16V DC power supply, a
DALI-compatible scene select station, and a DALI-compatible digital ballast.
From there, additional components can be added to this simple energy management
platform, such as occupancy sensors and photosensors. The system could form a
network controlled by a central computer for scheduling, with occupant
overrides. For large installations of whole floors, whole buildings or multiple
buildings, DALI buses can be networked together.
Is it true that DALI systems are very expensive?
Fluorescent dimming presents a higher cost than other control strategies such as
scheduling an entire building’s lights to switch to shut off at a desired time.
You also gain more flexibility, the ability to conduct load shedding without
turning off the lights, and other benefits such as lamp/ballast maintenance
reporting. If fluorescent dimming is selected as a control strategy, the next
choice is whether to use analog or digital. Most analog systems are 0-10VDC
systems, which require low-voltage control wires for communication. Compared to
0-10VDC systems, digital dimming systems can present a higher component cost,
primarily due to addition of the power supply and router. If a gateway is
required for integration with a building automation system, cost increases.
However, compared to 0-10VDC systems, significant labor savings can be achieved
with a digital system that can more than offset the added component cost. The
result is that DALI-based digital systems often present a lower installed cost
than 0-10VDC systems.
What is a loop?
In a digital dimming system, a single set of control wires form a low-voltage
control bus. The term “loop” is often used interchangeably with the term “bus,”
but the DALI protocol actually prohibits loops. By IEEE definition, DALI is a
bus that can be installed in a daisy-chain, star or tree configuration.
Compatible ballasts and controls, up to a total of 64 devices (or 251mA)—with
each ballast having its own unique stored address—connect to the bus in order to
provide control signal interaction. For larger installations, multiple buses can
be networked to proper scale. The control bus provides two-way communication;
ballasts can both receive commands and respond with feedback.
Why should building professionals choose digital control and DALI?
According to David Peterson of Watt Stopper/Legrand, “The motivations will
depend on the role of the professional … For instance, a building owner will be
attracted by the reduced costs; reconfiguring a space will be far less costly
using DALI. This is an important consideration when you realize that the average
office space is leased for only seven years. Tenants and users will value the
flexibility a DALI system can give them in accommodating their specific needs.
Engineers will also find the flexibility DALI gives them to be an asset. And all
of these professionals will recognize the importance of a system that can
provide these benefits along with the added potential of more effective energy
management.” (AutomatedBuildings.com interview, June 2003.)
What are the most suitable applications for DALI?
According to David Peterson of Watt Stopper/Legrand, “Every type of lighting
control technology and product has optimal applications as well as ones where
the result is less ideal. With that in mind, I would say that the greatest
potential for DALI is in those spaces with multiple uses and areas where
lighting levels and configurations are likely to change over time. Conference
rooms, classrooms, and lecture rooms are good examples. Each can take advantage
of DALI's flexibility and multiple scene control. Using a stand-alone wall-box
controller in a lecture hall, for instance, a speaker can push a 100% scene
button. For an A/V presentation, the same lecturer can push the ‘A/V’ scene
button and the lighting will fade to a lower level, with some fixtures
completely off and some at a lower output so students can still see enough to
take notes. The reduced cost of installation as well as the simplicity of DALI
may make dimming control particularly appealing for smaller conference and
meeting rooms and private offices, where it might not otherwise be considered …
There are also some broad functions that DALI is especially well suited for,
such as demand reduction, load shedding and daylighting … In the area of
daylighting, DALI offers the ability to truly integrate lighting fixture by
fixture with daylighting controls to achieve a pleasing lighting distribution
throughout the space. Up to now, this has been [difficult] to achieve because it
requires programming the response of specific fixtures depending on their
location within a space relative to the daylight source while also providing for
the unique needs of each occupant. DALI technology will make this customized
control practical, as DALI-compatible daylighting control devices continue to be
developed in this realm.” (AutomatedBuildings.com interview, June 2003.)
BALLASTS AND CONTROLS
What ballast and lamp types are covered by DALI?
DALI-compatible digital ballasts are 120/277V fluorescent dimmable
programmed-start rapid-start electronic ballasts currently available in one-,
two-, three- and four-lamp models for T8 lamps; and one- and two-lamp models for
compact fluorescent, T5 and T5HO lamps. DALI-compatible digital controls can
also provide precise dimming of 12V and 120V incandescent lamps.
What is the dimming range for DALI ballasts?
Digital ballasts are available that provide a dimming range of 100% to 1% for
linear fluorescent lamps, 100% to 3% for compact fluorescent lamps and 100% to
0.1% for incandescent lamps, utilizing a logarithmic dimming curve. The
inverse-square dimming curve is used for better control of the lighting
intensity in response to the human perception of brightness. Digital ballasts
can start the lamp at any desired dimmed level.
DESIGN & OPERATION
Is it true that a computer is required to operate a DALI system?
No. A computer is not required for a basic DALI lighting control installation. A
computer would be required to implement the status monitoring features of DALI
and it provides an easy means to modifying the system settings. Click here to
see diagram for simple system, which will open as a new window on your web
Can a DALI system be integrated with a building automation system?
According to Stuart Berjansky of Advance, “Each DALI system can control up to 64
ballasts, each of which is individually addressable. Via a DALI [bus], ballasts
are connected with standard building wire to a DALI controller, which can be
connected to other controllers for centralized control of larger areas. The DALI
system can then be either a stand-alone subsystem or a pure subsystem to the
Building Management System. In the stand-alone scenario, only the most important
information will be sent to the BMS. With a pure subsystem, the DALI system
communicates bi-directionally via a gateway or transmitter and is an integral
piece of the BMS. The gateway is connected to the low-voltage DALI cables on one
side and to the BMS network bus on the other.” (AutomatedBuildings.com
interview, September 2002.)
DALI systems enable personal dimming control for occupants. Why should
occupants be given personal control?
Studies indicate that office workers have a wide range of light level
preferences, and feel they would be more satisfied if they had control over
their lighting. However, lighting systems are typically designed as fixed-output
systems, a one-size-fits-all approach. Personal dimming control allows occupants
to choose their own light levels. One office lighting field study, conducted by
the Light Right Consortium, revealed that office workers were more satisfied,
vigilant and motivated with an indirect lighting/wall washing scheme with
personal dimming control than with standard parabolic fixtures.
Why is DALI particularly advantageous for daylight harvesting projects?
Daylight harvesting entails switching or dimming lighting systems in response to
available daylight in a space. However, the amount of daylight varies according
to distance from the daylight aperture. As a result, dimming the light fixtures
around a daylight aperture together can result in some spaces having a higher or
lower light level than required. To address this, a higher degree of granularity
is required. Designers may set up fixtures adjacent to a window, for example, on
parallel circuits so that the fixtures closest to the window are controlled
separately from the next farthest row, and so on. This strategy maximizes energy
savings and assures the right amount of light. With a DALI-based control system,
each ballast or fixture can be designated as its own control zone, up to 16
zones. The granularity of the lighting is therefore limited only by this number
and the number of photosensors the designer wishes to add. Higher granularity
delivers the potential for even greater energy savings and assurance of proper
WIRING & INSTALLATION
How are digital ballasts wired into the lighting system?
Digital ballasts can be wired into the lighting system using Class 1 or Class 2
methods, according to the National Electrical Code (NEC). Digital ballasts may
use a Class 1-rated 5-conductor cable that uses one hot (live), one neutral, one
ground and two polarity-insensitive control wires, all routed together in the
same conduit. It is also possible to install the ballasts and controls as a
Class 2 installation, in which case the control wires must be routed through
separate conduit as the power wires. Check with the ballast and controls
manufacturers to determine whether their products are UL-listed for Class 1
How does the wiring of a DALI dimming system compare to the wiring of a 0-10V
According to Jim Yorgey of Lutron Electronics, “The difference between the DALI
system and the 0-10VDC system is that with DALI you can turn any ballast (or
group of ballasts) ON/OFF or DIM without rewiring the circuits. With 0-10VDC,
the ballasts must be wired together with control wires, then the controller only
dims, it does not turn the lights on or off. You would have to re-wire the power
to match the dimming circuits to get the on/off function.” Click here to see an
What benefits does two-way communication provide?
In a 0-10VDC dimming system, control signals are one-way between the controller
and the ballast—i.e., from the controller to the ballast. In a DALI system,
signal traffic is two-way, meaning ballasts can be commanded to perform
requested actions, such as switch ON/OFF or DIM, but can also be queried to
provide information about their status. The digital ballast can be queried, for
example, about intensity, which provides information about energy consumption.
This information in turn can be used for energy savings verification,
benchmarking and tenant or department billing. The digital ballast can also be
queried about lamp and ballast status, which provides information about whether
the ballast and its connected lamps are still operating. This information in
turn can be used by facilities departments to improve customer service and make
their lighting maintenance operations more efficient.
STARTUP AND COMMISSIONING
What is involved in commissioning or starting up a DALI system?
Digital control requires programming when centralized systems are used, and all
systems on-site field commissioning, which should be factored into the design
specification so that the appropriate party is aware and can bid on this portion
of the installation. During the start-up phase, a database of ballast addresses,
with physical locations and the control device that operates them, needs to be
created and then maintained when the layout of the space changes. It may be
advisable to involve the client’s IT staff in the creation and maintenance of
DALI Hotel emergency lighting, Hospital emergency lamp system.
Lighting Interface for fluorescent tube lighting
The DALI (Digital
Addressable Lighting Interface) protocol has set forth the requirements for a
digital fluorescent ballast that out performs its predecessors with respect to
flexibility and functionality. The advantages of a DALI lighting control system
range from advanced dimming capabilities and daylight sensing to saving money in
energy and maintenance costs. A DALI lighting control system can also be
beneficial to designers when trying to meet the requirements of code or
recommended practices. The information in this report will help designers decide
when to consider using a DALI lighting control system. This report covers topics
such as the advantages of digitally addressable lighting, the equipment required
to make a DALI system work, the limitations and drawbacks of DALI, cost
information on installing and using a DALI system, and how DALI can help meet
code and recommended practices, and concludes with a case study demonstrating
how a DALI system has the potential to save money in energy costs.
Lighting Interface for LED lighting
We accept customized design
Digital Addressable Lighting Interface for LED lighting. Microcontroller for
lighting, MCU controlled lighting. This circuit shows how to work of the Dali
This photo shows example how to use DALI bus,
Just need 5 wires as a bus in Premises
Distribution System. Than all the bulbs connected on this bus can be controlled
by one Microcontroller equipment, No many switch, No much wire, And it is easy
automatic controlling. Hall lighting system, Sports Hall lighting system,
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