LED dimmers and their different dimming methods
LED (Light Emitting Diode) lighting systems have become one of the most popular lighting solutions in recent years due to their energy efficiency and durability. The ability to dim LEDs allows for flexible lighting control and creates different atmospheres indoors. In this paper, we examine various LED dimming methods such as DALI, DMX, KNX, CASAMBI, Zigbee, Enocean, and Trelight. We also look at the distinction between primary dimmable LED dimmers and secondary dimmable devices, and the importance of proper operation (constant current or constant voltage) of LEDs.
1. primary dimmable LED dimmers
Primary dimmable LED dimmers are directly connected to the power supply of LEDs and provide high precision lighting control. These dimmers use different signal protocols to adjust the brightness of the LEDs. Here are some of the most prominent dimming methods:
(a) DALI (Digital Addressable Lighting Interface).
DALI is a widely used digital communication protocol used in lighting control. It allows individual control of multiple luminaires via a single cable. DALI dimmers offer great flexibility and can be used in larger commercial lighting systems.
b) DMX (Digital Multiplex)
DMX is often used in entertainment lighting, such as stage and event applications. This protocol allows the control of various lighting components such as LEDs, moving heads and spotlights via a central control unit.
c) KNX (Konnex)
KNX is a general automation protocol that is also used in building lighting. KNX dimmers enable the integration of LED lighting into an intelligent building system that provides control of lighting and other electrical devices.
CASAMBI is a wireless lighting control system based on Bluetooth Low Energy (BLE). It is controlled via a smartphone app that allows for easy and flexible lighting adjustments. CASAMBI dimmers are easy to install and are particularly suitable for use in residential and small commercial environments.
Zigbee is a wireless communication protocol designed for the Internet of Things (IoT). Zigbee dimmers allow wireless control of LEDs and can be integrated into larger smart home systems.
EnOcean is a wireless battery-less communication protocol based on energy-efficient technology. It is often used in building automation systems and allows LEDs to be controlled without wiring.
Trelight is another wireless lighting control system designed specifically for LED lighting. It allows intuitive control of light intensity via a smartphone app.
2. secondary dimmable LED dimmer
Secondary dimmable LED dimmer are placed between the power supply and the LEDs and allow brightness adjustment by regulating the current or voltage supply. Here are the two most common types:
(a) constant current dimmers.
Constant current dimmers provide precise control of brightness by varying the current flow through the LEDs. This type of dimmer is particularly suitable for LED luminaires with constant current requirements, such as high-power LEDs with a current rating of 350 mA, for example.
b) Constant voltage dimmer
Constant voltage dimmers control brightness by adjusting the voltage to the LEDs. They are often used in LED strips and LED modules that require a constant voltage.
LED dimmers play a crucial role in lighting control and create versatile lighting options for residential and commercial spaces. The choice of the right dimming method and the appropriate dimmer type (primary or secondary dimmable) depends on the specific requirements and the type of LEDs used. The various dimming methods such as DALI, DMX, KNX, CASAMBI, Zigbee, Enocean and Trelight offer different lighting control options and can be selected depending on the application and Environment.