You might need a constant-current LED driver or constant-voltage power supply when you have a led light project. What is the differences between those working mode power supply?
Constant-Current Drivers
In order to prevent LEDs from being overdriven, LEDs typically have a power-limiting device (either driver or resistors). A Constant Current Driver is used to regulate the amount of current that is supplied to an LED or LED array to maximize LED lifetime. LED brightness can fluctuate and life span can be shortened if current is not regulated. The constant-current driver is used for LEDs or light fixtures that require a stable output current and operate within a range of voltages. Most finished LED products already have a constant-current driver or resistors to regulate current. If you’re building an LED fixture or replacing a constant-current driver, it’s important to verify that the output current and voltage of the driver is compatible with the LEDs’ current and voltage. If your LED product already has a constant-current driver or uses resistors in the LED array, you might need a constant-voltage power supply.
Constant Voltage Power Supplies
Constant-voltage power supplies can be used to power LED products that have resistors or constant-current drivers. Products with these current-regulating devices might require a constant-voltage power supply if they need a different operating voltage than what’s supplied by the power source (home, vehicle, etc.). In some cases, constant-current drivers matching the voltage and current requirements of both the product and the power source (home, vehicle, etc.) are available, and a constant-voltage power supply wouldn’t be necessary.
Recently, Smarts Electronics are in the process of changing their UL Listed Constant Voltage LED Driver and constant current led driver into ETL listed. But do not worry, ETL and UL are all workable in North America. And their design solution is the same.
More details or questions you want to know about Smarts Electronics’ led power supply, you can login http://www.smarts-electronics.com/
Or contact with Mr. Steven(skype: steven821228
mail:steven@smartselectronic.com.cn) .
