LED Driver Modules, Current AC/DC LED Drivers, ESD-240S660DT, Inventronics

 A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons.

https://www.futureelectronics.com/p/semiconductors--Led-lighting-components--led-driver-modules-rev--constant-current-acdc-led-drivers/esd-240s660dt-inventronics-9053616