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Message: <blockquote data-quote="levin818" data-source="post: 1064353785" data-attributes="member: 849">From what i can see from the picture, you connected 4 LEDs in parallel, then series a 100ohm 1/4W resistor for current control. Right?It is not wrong to connect in this way but you need a high wattage resistor to handle the power dissipated by the resistor.Assuming your LED's forward voltage is 3V, battery voltage is 13V.Voltage across the resistor is, 13-3 = 10VPower dissipated at the resistor is (10)(10)/100 = 1WIt mean, minimum requirement for the resistor's wattage is 1W. Reliable manufacturer usually use 2W to increase the reliability.Your resistor is only 1/4W, sure burn!---------- Post added at 11:35 PM ---------- 6 hour anti-bump limit - Previous post was at 11:20 PM ----------To light up 4 LEDs with 13V supply, a more suitable (efficient) way should be connecting the LED in series, like what TitanRev does.You will greatly reduce the heat/power dissipated at the resistor compare to parallel connection.</blockquote>

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