When it comes to lighting, the luminosity plays an important role. Luminous power is often referred to as luminous flux and it is where one measures the perceived power of light of a certain device. Each lighting device will project a certain level of luminous flux which will affect how the human eye see the lighted areas or surface.
In LED, luminosity is very important as it will define how much light is being projected and the brightness that it produces. As with all other types of elements in standard lighting, there is a specific way of reading luminosity and this is measured through as lumen or lm. lm is the standard unit (SI) used in this industry.
In this context, one must understand the concept of one candela (which comes from the word candle). 1 lm (one lumen) basically refers to the amount of light that emits one candela of intensity. This is taken through a solid angle with consistent flare. This means that the higher the lumens (lms), the brighter the source will be. Here, 1 lm refers to about the source of 1 candle light which means that if a device emits 100lms, it represents the metaphor of 100 candle lights.
In LED, the same measurement is used. When a module provides a Luminous scale of > 500lms, it means that it is able to emit more than 500 lumens. This could go to as high as 2000 lms which are commonly used for larger screens and lighting devices.