LED Constant voltage drivers offer a large range of products and also have builtin protection that is required for LED products the constant voltage LED driver offers stability to LED units preventing harmful current fluctuations from the power source to the LED. While LED constant voltage drivers come in a variety of models, depending on the voltage and the output of the LED, they have one thing in common. They supply a constant voltage of regulated power to the LED. All LEDs are sensitive to current fluctuations, and without this constant voltage, LEDs can experience shortened life spans and malfunctions, ranging from dimming to outright failure.