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  1. I have LED: CREE XR-E Q5 high power LED Light Emitter White Aluminum base 5W XLamp I read that for LED needs current limiter circuit. I find LM 317 calc and enter current 1A and Voltage 3.3V: I see that i need resistor 1.3 Ohm. But I need connect my LED to 12V. And don't understand how I must connect it's. I need two LM317? First LM317 for lower the voltage to 3.3V. And two LM317 for current limit?
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