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Lighting Knowledge Center

What is Light?

Visible light is the the part of the electromagnetic spectrum that can be perceived by the human eye. The wavelength of visible light ranges from 380nm to 780nm for humans, with the highest sensitivity at around 555nm.

What is color?

What the human eye perceives as color is defined by the surface composition and reflective index of a material. These define which parts of the emitted “light” spectrum of the sun or any other light source are absorbed by the material or are reflected and reach the human eye.

What is Lumen/Luminous flux?

Lumen/luminous flux is the part of the emitted radiometric power of a light source that is in the range of visible light (380-78nm) and weighted with the average spectral sensitivity of the human visual perception of brightness.

What is CRI?

The color rendering index (CRI) is a quantitative measure of the ability of a light source to reproduce the colors of various objects faithfully in comparison with an ideal or natural light source.

How do you define "LED module"?

An LED module is a unit containing one or more LEDs supplied as a light source. In addition, it may contain further components, e.g. optical, mechanical, electrical, and electronic components, but not the control gear.

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.

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 the 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.


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