Constant Voltage and Constant Current Difference

	Advantage	Defect
Constant Voltage	The control circuit is simple and inexpensive Given a fixed voltage or current will be automatically determined (light source 2pin can)	In the LED light source applications, the light source requires an external limiting resistor (6V / 12V / 24V for the common specifications), less efficient! Applicable to small current light source (1.5A or less)
Constant Current	LED light source brightness stability No additional limiting resistor, the efficiency is better Suitable for high-current light source applications (1.5A or more)	The control circuit is complex, the price is higher Need current identification Pin (light source at least 3Pin), each control specification is not uniform In addition to increasing the current at the same time, the need for over-voltage protection (6V / 12V / 24V for the common specifications)