An LED driver is a device that regulates electrical power going to a group or single LED light bulb. The LED driver manages the electricity used by the LED by maintaining a constant flow of power based on changes in the bulb's temperature.
The LED driver acts as a self-contained power supply which adjusts its output depending on the type of LED light being attached to it. Some LED drivers can also facilitate dimming and allow individual control over multiple strings of LED lights through multiple channels. Without an LED driver, LED light bulbs may become unstable in temperature and risk failure.