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High Power 1W 3.2V 350mA Pure White 6500K LED (generic picture)
Application Note
These run well on 3.2V each thus 3 in series and a 15ohm resistor can be hooked up to a 12V battery system. Use a resistor with a high enough Watt rating, preferably 5W or better. Use a 1.5ohm -> 2ohm resistor if driving a single LED off a Lithium Ion battery of 3.7V. Take care not to overheat the LED.
If you use <15ohm resistor then mount the LED's on a heat sink to prevent it from overheating.