LEDs for vehicle?

synergy said:

I tried testing 1 of them with a 560ohms resistor on a 9V battery, initially able to light up properly and bright enough, but after awhile, the LEDs just blown off.

Cheers!

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With that combination you probably were not drawing more than 10 to 12 uA of current, which would not blow the LED. Are you sure of the resistor's value?

10-12:mu:A?

Don't you mean mA?

I calculate between 4mA to 13mA depending on the voltage drop of the LED and how fresh the battery is.

for cars, you must calculate 2 cases, minim voltage (12,6V) and maximum voltage (14,5V), curent max. 20mA (minim recomandated is 7mA) and tension at LED's depend by..colour
- red: 2V
- yellow/orange: 2,2V
- green: 3,3V
- white/blue: 3,5

some example with group of LEDs for use at cars can see at end of **broken link removed** (rosu=red, galben=yellow, portocaliu=orange, verde=green, alb=white, albastru=blue)

niq_ro said:

- green: 3,3V

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Be careful with green, yellowish green tends to be a slightly lower voltage than bluish green or pure green.