Dimming control types

 

Home Automation

Our led down light range maybe integrated with smart home automation systems.Utilising Dali Trailing or leading edge or 0-10v dimming solutions

 

Further information on dimming protocols and products can be found below:

DALI

DaliDALI stands for Digital Addressable Lighting Interface. The DALI protocol is managed under IEC standard 62386, recognised internationally as a global standard for professional digital lighting. The ‘open protocol’ means, in principle, a DALI lighting system can be composed of components from multiple manufacturers, all working from the same standard. As with all products however, individual DALI components can still vary considerably in quality and longevity according to supplier.

 

All you need to know about DALI


DALI stands for Digital Addressable Lighting Interface. The DALI protocol is managed under IEC standard 62386, recognised internationally as a global standard for professional digital lighting.  The ‘open protocol’ means, in principle, a DALI lighting system can be composed of components from multiple manufacturers, all working from the same standard. As with all products however, individual DALI components can still vary considerably in quality and longevity according to supplier.

The DALI standard covers not just ballasts but control gear including LED drivers, switching devices, emergency inverters, colour controllers, and the control devices such as presence detectors, lux level sensors, switches, etc, as well as bus power supply requirements.

A DALI system where dimming and individual control can be provided, can be a source of significant energy savings. When dimmable drivers, presence detectors and lux level sensors are installed with appropriate parameters programmed, savings of up to 80% are achievable.

An additional advantage with DALI is the ability to make changes via programming only, rather than the high costs involved in re-arranging or re-grouping lights in a fixed output system.

The two-way communication that can be provided with a DALI system allows for easier monitoring of energy consumption, and lamp condition, and can also provide automatic testing and reporting of emergency lighting.

The electrical manufacturers supplying DALI compliant products must be DALI members and their products must bear the DALI trademark. A list of members can be found at www.dali-ag.org

By using an interface between a DALI system, and another protocol, it is acceptable to connect multiple systems together. For example connecting a wireless system to DALI enables the luminaires to be wired, and therefore low-cost, but allows for the convenience of wireless in terms of sensors and switches. DALI interfaces well with a number of protocols including those commonly used in New Zealand such as C-Bus and KNX, and the CP Electronics range of standalone DALI controls.

A DALI project may be as large as required, allowing thousands of devices to be connected to a single system. Or it could simply consist of a single luminaire with an on-board driver and sensor!

DSI

TreidonicDSI (Digital Serial Interface) was a precursor to DALI. Developed by Tridonic in 1991 it was one of the first proprietary protocols to digitally control electrical ballasts.

Hard-wired groups of luminaires are given a DSI instruction to follow. Every ballast that is physically wired to a particular control group, will dim as that group. Individual DSI ballasts are not uniquely addressable as is the case with DALI.

 

0-10v (Analogue)

0-10v (Analogue)One of the earliest, and simplest ways of controlling lights, 0-10V or analogue is still widely used to control dimming functions for fluorescent ballasts and LED drivers for commercial and industrial lighting. The dimming range of the power supply or ballast is often limited. If light output can only be dimmed to 10% then a relay or switch must be provided to turn off all power to the system, and therefore turn the light completely off.

\

All you need to know about 0-10v (analogue)


One of the earliest, and simplest ways of controlling lights, 0-10V or analogue is still widely used to control dimming functions for fluorescent ballasts and LED drivers for commercial and industrial lighting. The dimming range of the power supply or ballast is often limited. If light output can only be dimmed to 10% then a relay or switch must be provided to turn off all power to the system, and therefore turn the light completely off.

For dimmable fluorescent lights the analogue system works at 1-10v, and is now often being superceded by DSI or DALI.

Analogue remains a popular system with some as it is easy to understand, install and to trouble shoot! Additionally its low current (typically 1mA) allows it to be run along relatively thin cables with little drop in voltage. It does require a wire per control channel however, plus a common return wire. A large and complex installation could therefore have hundreds of wires, requiring expensive multi-core cabling and abundant connectors. Interference from nearby AC power cables can also affect signals to the fitting, even to the extent of causing flickering.

It should be noted that although a 1-10v system is considered low voltage, it should still be treated with caution as a mains voltage to earth could still occur if there was a fault on the light fittings.

LEDs

The lower power, longer lifespan benefits offered by modern LED technology is resulting in huge migration from traditional incandescent and fluorescent lighting. Not just for general illumination, but in digital signage and for decorative lighting, taking advantage of the high level of versatility that LED based lighting can deliver.

\

All you need to know about dimming LEDs


The lower power, longer lifespan benefits offered by modern LED technology is resulting in huge migration from traditional incandescent and fluorescent lighting. Not just for general illumination, but in digital signage and for decorative lighting, taking advantage of the high level of versatility that LED based lighting can deliver. Read more . . .

With more and more LEDs being specified, it is crucial that the consultants responsible for creating the lighting system design are confident that the LEDs proposed in their design, can deal with the potentially harsh operational or environmental conditions that they may be exposed to.

Traditional ballasts tend to mask fluctuations in power with minor surges or spikes having little visible effect, although decreasing the life of the lamp. LED lighting however responds immediately to any slight change in power, and the result is visible as a higher pulse or flash of light.

The LED driver is therefore crucial to ensure fluctuations in power do not affect light output, or life of the LEDs. Commercial LED fittings are commonly being incorporated into DSI and DALI systems, or can be controlled by 0-10v analogue systems.