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High-power LEDs (like all LEDs) are current-driven devices. This means that the higher the current, the brighter the LED. This differs from traditional lighting products, where higher voltages produce brighter light.
This is an essential concept to understand when working with LEDs, as most power supplies are designed to regulate voltage, not current. So, connecting an LED to a standard DC voltage-regulated power supply (such as a DC wall adapter) will almost certainly destroy the LED as the current is not regulated.
Most designers use current regulating LED drivers between a DC power supply and the LED. The driver ensures that the current to the LED is never allowed to exceed the maximum current rating of the LED.
The output voltage of the DC power supply is not important as long as it is at least a few volts higher than the LED’s Forward Voltage rating (Vf). For example, you could use a 24VDC power supply to power a single LED with a Forward Voltage rating of 3.15 Vf, as long as you include a suitable current regulating driver between the power supply and the LED.
There are many different kinds of current regulating drivers, but pulse width modulated (PWM) drivers are generally preferred for the highest efficiency. They are small, cool running, and highly efficient. We offer a complete line of ready-to-use current regulating drivers designed to power high-power LEDs.
These drivers are straightforward to use. Connect a DC power supply to the driver’s input and the LED to the output. The driver will ensure that the current to the LED is never allowed to exceed safe levels.
