LED light engine or LLE is the combination of one or more LED modules, together with an LED driver (also known as electronic control gear, or ECG).
Some LLEs contain an integrated driver, while some LLEs consist of one or more LED modules together with a separate driver. Therefore, LED Light Engine is a device between LED fixtures and LED Luminaire.
An LED Light Engine is an integrated assembly composed of one or more light emitting diodes (LEDs) or LED arrays (modules), as well as an LED driver and other optical, thermal, mechanical and electrical components. Light engines are typically ready-to-light and only require an input voltage.