High brightness LEDs require constant current drive because they are sensitive to changes in current. Unlike traditional light bulbs, LEDs do not have a filament that can handle a wide range of currents. Instead, LEDs are made of semiconducting materials that emit light when a current flows through them.
When the current through an LED is too high, it can cause the LED to overheat and ultimately lead to its failure. On the other hand, if the current is too low, the LED may not emit enough light, and the brightness will be reduced. Therefore, to ensure that the LED operates within its safe and optimal operating range, it is essential to provide a constant current source.
A constant current driver for an LED helps regulate the current and provide a steady flow of electricity to the LED. It ensures that the LED receives a constant amount of current, regardless of the changes in voltage or temperature. This, in turn, helps maintain the brightness and efficiency of the LED while ensuring its longevity.