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High power single LED driving Circuit

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imneoleo

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Hi,
Somewhere in my project, I've to drive a power LED. My operating voltage is 9V to 16V & I've to limit the current flowing into LED to 500mA. Initially thought of using a series resistor but the wattage is coming so high. Could anyone pleasehelp me in designing simple, efficient & cost effective circuit.
 

Why the operating voltage range is so wide?

Better use the following circuit
Assemble-it.jpg
The constant current source has a drop voltage of 3 V, so the supply voltage should always be 3 V higher than the LED voltage and can be up to 37V which is the maximum input voltage of the LM317.

See datasheet to calculate resistance also you must read this
 
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Failing that, use a dedicated LED Driver chip. LTC3741 for example
 

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