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Are they any good and how do they compare to different types of halogen/hid headlight? Pics?

 
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what do you mean?

like the actual 5mm led?

or white led in a headlamp?

 
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White 194 led bulb from superbrightleds.com

 
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Had them in my corner lights, from the same site. They were just tiny points of light (headlights are fully gunmetalled). Nowhere near as bright as halogen hyperwhites or even stock, but the light was a perfect white. Very nice. I kept blowing mine though, and I have no idea why. Right now I've got just a pair of halogen 194's in there, may go back to LED if I can figure out why I keep blowing them. I have a feeling the voltage running to them is fluctuating (audio system)...

 
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Hmm, but voltage fluctuation shouldn't matter. I've blinked a led hundreds of times touching wires and still fine. Unless you're getting high spikes, but resistors should take care of that. I've had my 7443 for a few months and no probs. Do you think the white directional 194 leds would be as white as hid 4300K?

 
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the white leds would be pure white... so it should be as white as the hid 4300k if not "whiter". and i also think them burning is 'cause of spikes. do those led turn signals have built in resistors?

 
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Yeah mine do. They wouldn't last more than a few seconds without resistors. I guess my ride doesn't have voltage spikes, cause so far so good. I have no problem with those 7443 leds.

 
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do you know what's the resistant on those resistors? 'cause maybe they didn't put enough resistant on the circuit in attempt to make them brighter, but will burn out once it hits a spike.

haha, and i guess you can relay the turn signals to eliminate the spike, but that's kinda too much work just for turn signal.