LED's are just about to drive the bulb out of many applications. While for a simple control LED is usually a simple resistor is sufficient, modern high-power LED usually need a special driver circuit to a constant Desiring to ensure current and to use the lifespan and optimal brightness.
Frequently used for this one then switching controller (Step-Up / Step Down) to produce only Gerig losses.
Here links to LED driver circuits

Here you will find Schematic Circuit Diagram for DIY and further information on LED Drivers
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Interesting site to control LED

www.led-treiber.de