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High-power LEDs generate a lot of heat. Therefore it is not advisable to place high power LEDs and resistors on the same circuit for fear of exceeding the working temperature of LEDs.

For this reason, the current for high performance LEDs is stabilized in the source and not in the circuit as is the case for low power LEDs (figure 24).

High power LEDs are therefore powered by stabilized current sources.

Example

We want to power 7 white high power LEDs placed in series:
>>If=350mA
>>Vf=3.4V

For example we select a 14PU21 type power supply from EREA that provides 350mA current in a voltage range from 1 to 28V based on load for maximum power of 10W.

Figure 26: High performance LED placed in series on a stabilized current source

Related posts:

1. Power supply of low power LEDs (<0.5W) through stabilized continuous voltage sources
2. Low Cost Power Supply for High Power LED Applications
3. Basic Knowledge about Different Kinds of LED Power Supplies
4. On Application of High Power LED to Signal Lamps
5. Some Commonly Used LED Circuit Connection Modes