Here are some additional notes on typical uses for the constant current and constant voltage applications.
Constant current drivers typically provide better lighting consistency, especially when dimming is a requirement. LEDs are a non-linear device, which make them inconsistent. A small increase in the voltage can cause an exponential increase in current, and this can sometimes damage an LED if not properly regulated. Thermal runaway is also less prevalent in constant current circuits which improves the reliability of LED’s that are on for extended periods of time. Thermal runaway is the term used when a component’s external or internally produced heat self induces its bias, which increases the current through the device. Although a constant voltage driver is voltage regulated, the LED voltage drop itself may fluctuate as the LED turns on or heats up. Constant current drivers are more common in true series circuits, they can also be found in some series-parallel combinational circuits. Keep in mind when an LED(s) burns out, gets damaged, or is cut from a strip in a combinational constant current circuit that the remaining LEDs may be damaged, as the fixed current may be too high for the remaining LEDs.
Constant voltage drivers are more common in multi-color displays, and series-parallel combinational LED strips with built in resistors or some other current limiting device. Constant voltage drivers are also usually the requirement for addressable LEDs, as these types usually have a constant current driver chip built within each LED. Constant voltage drivers are easier to work with as you can add or remove LEDs from the circuit as long as the current of the driver is equal or higher to that of the total LED current.
Although LED drivers are recommended for LED lighting, it is common to see industrial power supplies like these to drive LED lighting as these typically have a very tight voltage output tolerance. For further reference, please see Constant Voltage LED Driver vs AC/DC Power Supply.