Frequently Asked Questions (FAQs)

To help provide information on Zhaga and its activities, we have compiled a list of frequently asked questions (FAQs). A small selection of FAQs are shown below.

This page is currently being updated. A more comprehensive list of FAQs will be posted soon.

If you have further questions, please feel free to contact us and we will respond as quickly as possible.

How do you define "LED light engine"?

Zhaga uses the term "LED light engine" to describe the combination of one electronic control gear (ECG) and one or more LED modules.
See more on LED light engines

How do you define "LED module"?

An LED module is a unit containing one or more LEDs that is supplied as a light source. In addition, it may contain further components, e.g. optical, mechanical, electrical, and electronic components, but excluding the control gear.

What do you mean by "electronic control gear"?

An electronic control gear (ECG), also commonly known as an LED driver, is a unit that is located between the power supply and one or more LED modules to provide the LED module(s) with an appropriate voltage or current. It may consist of one or more separate components, and may include additional functionalities, such as means for dimming, power-factor correction, or radio interference suppression.

What does "interchangeable" mean?

Zhaga considers that two light sources are interchangeable when one light source can replace the other light source without any change in the luminaire.
See more on interchangeable light sources

Zhaga specifications

How does Zhaga enable interchangeability?

Zhaga develops interface specifications for different LED light engines. These define the interfaces - mechanical, thermal, optical electical and control - between an LED luminaire and an LED light engine. When applied correctly, these specifications ensure interchangeability. For example, Zhaga focuses on the mechanical and thermal fit of the heat sink, the size and height of the light- emitting surface, and the photometric properties regarding different application areas.
See more on interface specifications

Does Zhaga define the performance of LED light engines?

Zhaga does not specify the performance, quality, design or safety aspects of LED light sources. These characteristics are for each LED light source manufacturer to decide for themselves, based on their choice of technology and market approach. 

Do the Zhaga specifications restrict design freedom?

The Zhaga interface specifications define only the interaction between the luminaire and the light engine. They do not unnecessarily restrict the design of the light engine, or the design of the luminaire. The specifications allow innovation inside the light engine while keeping the interaction with the luminaire stable. 

Does Zhaga also specify the connection between LED modules and electronic control gear/driver?

No, Zhaga does not specify the interface between the electronic control gear (driver) and the LED module(s). This interface is rapidly evolving and not stable.

Will manufacturers have to use the Zhaga specifications in the future?

No, the use of Zhaga specifications is voluntary, and is not mandated by any government or regulator.

The Zhaga organization

Who or what is Zhaga?

Zhaga is a global consortium of companies from the lighting industry and beyond, founded in February 2010.

What does the word Zhaga stand for?

The word Zhaga is not an acronym and has no intended meaning. It is a waterfall in Sichuan province, China. The Zhaga logo stands for interchangeable LED light sources.

Who initiated the Zhaga consortium?

Zhaga started with broad support from the lighting industry. Twenty-two companies participated in the first meeting of the Zhaga consortium in March 2010. Since then, several hundred companies have joined Zhaga.
View the full ist of Zhaga members


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