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Old 07-13-2012, 06:20 AM   #16
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Low Voltage LED Lighting


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he's going to be running at 4A so the voltage drop is easy to figure out. voltage drop in low voltage makes a bigger difference because when you lose 5% of 12v it makes a way bigger difference then when you lose 5% of 120v.
Five percent of 12V is .6V (bringing voltage to 11.4). Five percent of 120V is 6V. Whether one is bigger or more critical I will leave to your expertise.

My understanding of LED is that they are generally current driven rather than voltage driven (like incandescent). I also understand that the retrofit LED lamps that I have used generally emit the same output within the specificied operating voltage (which is 10 - 15 volts in my case). I assume this is typical, but confirmation does not hurt.

If this is generally true across the board, then the variance in voltage at different parts of the wire is LESS critical than it would be for incandesent. My suspicion and experience suggest that not only will Cultcab be safe, but satisfied with the results.

Unfortunately, it does not look like cultcab is still around.

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Old 07-13-2012, 08:00 AM   #17
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Low Voltage LED Lighting


No a diode is triggered off voltage. Your standard diode in a pc board needs .7 volts to turn on. It literally acts like an open until the voltage hits that point. It will work with more voltage though. It's like a one way switch. If you put a meter on it it will only pass current one direction. I'm assuming that an led works the same as a regular diode in principle
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Old 07-13-2012, 12:19 PM   #18
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Low Voltage LED Lighting


I am sure you are correct with regards to diodes, themselves. My understanding is not about diodes, but about the entire electronic devices that are sold as replacement bulbs, based (in part) upon LEDs. These (at least the ones I have purchased and read about) are designed to operate over a specific voltage range with the on-board electronics providing constant power through the LEDs, themselves, within the specified voltage range.
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Old 07-13-2012, 12:37 PM   #19
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Low Voltage LED Lighting


Yup exactly. So while an led depends on the amount of current to dictate how bright it will get it still needs the right amount of voltage to cause the p and n meterial to conduct electricity. Once that voltage requirement is met then the current takes over.
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Old 07-13-2012, 03:37 PM   #20
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Low Voltage LED Lighting


Sort of.

The current governs the LED brightness more predictably than the voltage, and the current is given by the Shockley diode equation in
http://en.wikipedia.org/wiki/Diode

But, really, all the LEDs with a marked operating voltage have constant current drivers and their spec's are maybe not easily found.

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