What diode should I use for my motorcycle's dual headlight setup?

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The discussion focuses on selecting an appropriate diode for a motorcycle's dual headlight setup, specifically for two xenon headlamps. The user requires a diode that can handle a battery output of 12V and 4A, with each headlight outputting 12V and 35W. It is established that the diode should be rated for at least 6A to accommodate the current load and must be mountable on a heatsink, which should be insulated from ground to prevent short circuits.

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I need to know what diode to use for the following spec:

I need to use this for my motorcycle. I have 2 xenon headlamps working on my bike but 1 lamp lits up for low beam and the other for high beam, now I need to light up both which means I've got to use a diode. Need to know which is the best diode for this purpose?

Battery output: 12v, 4A
Headlight output: 12v, 35w
Xenon Ballast input voltage, 9-16v
 
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Post a schematic. If you have a single ballast and two arc lamps you can't run them both.
 
I have two ballast individually for both the lamps. But when i turn on the low beam one bulb lights up n for the high beam the other bulbs lights up. I need both the bulbs to light up when i turn on High beam. Th e output voltage for the bulb is 12v, 35w.
 

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[PLAIN]http://dl.dropbox.com/u/4222062/lamps.PNG

The diode would be carrying about 3 amps, but should be rated for about 6 amps. It would need to be the type you can mount on a heatsink. Insulate the heat sink from ground.
 
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