Would this work fine on AC?

Yes, LED chips are DC, but the lamp can certainly be designed for either, or both.

The only way to know for sure whether this lamp will work on AC is to try it.
 
LarryFine said:
Now that you mention it, I remember car interior-light LEDs having instructions saying to flip the bayonet insert if it doesn't work the first try, which suggests that polarity reversal doesn't hurt it, further suggesting that AC won't hurt it either, finally suggesting that it will work on AC.
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Doh! The simplest circuit for dealing with polarity. Have a single rectifier diode to protect from reverse voltage (half the voltage drop of a full bridge rectifier), and have the user flip the bulb around if it doesn't work the first time.

This suggests that it might work with AC, but at approximately half the brightness.

Besoeker3 said:
The original post says that it is LED. That IS DC.
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The original post says that it is a 'LED wedge base bulb'. That is a LED in combination with other components. The other components ensure that the LED gets DC; the question is about how the balance of system will respond to AC.

Sometimes it is useful to understand what is going on under the hood, and how a system will respond when used out of spec. Because sometimes you have a square peg and a round hole and you need to know the constraints to make the design work.

For example, most switching power supplies rectify the input AC to DC prior to doing their magic. Many common ones are specified to work from 100V to 240V 50-60Hz AC input power. If you understand what is under the hood, then you will be able to evaluate if the power supply would function with for example 400 Hz AC input, or with a DC input.
 
winnie said:
Doh! The simplest circuit for dealing with polarity. Have a single rectifier diode to protect from reverse voltage (half the voltage drop of a full bridge rectifier), and have the user flip the bulb around if it doesn't work the first time.

This suggests that it might work with AC, but at approximately half the brightness.



The original post says that it is a 'LED wedge base bulb'. That is a LED in combination with other components. The other components ensure that the LED gets DC; the question is about how the balance of system will respond to AC.

Sometimes it is useful to understand what is going on under the hood, and how a system will respond when used out of spec. Because sometimes you have a square peg and a round hole and you need to know the constraints to make the design work.

For example, most switching power supplies rectify the input AC to DC prior to doing their magic. Many common ones are specified to work from 100V to 240V 50-60Hz AC input power. If you understand what is under the hood, then you will be able to evaluate if the power supply would function with for example 400 Hz AC input, or with a DC input.
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Sounds pretty simple😏
 
The original post is DC. Just DC If you want AC you would double the number of LEDs. It's that simple.
 
Besoeker3 said:
The original post is 12V DC. You'd have to alter it if you want AC.
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Not really. You just connect it. Several possibilities exist. If it is just a string of LEDs with a resistor, then it will operate but at half the brightness on AC as it will be on DC. Or it could have an internat bridge rectifier which will make it work on either AC or DC of any polarity. Simple.
 
CoolWill said:
Not really. You just connect it. Several possibilities exist. If it is just a string of LEDs with a resistor, then it will operate but at half the brightness on AC as it will be on DC. Or it could have an internat bridge rectifier which will make it work on either AC or DC of any polarity. Simple.
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You could do anything you like but but the original topic is 12V DC.
 
Besoeker3 said:
You could do anything you like but but the original topic is 12V DC.
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I don't know what you mean by "original topic is 12 vdc". No the original topic is would there be any ramifications of providing these with AC. Perhaps that you missed that the base on these is symmetrical and not polarized? Do you find it odd to say something needs DC but then not indicate polarity on the input terminals?
 
electrofelon said:
I don't know what you mean by "original topic is 12 vdc". No the original topic is would there be any ramifications of providing these with AC. Perhaps that you missed that the base on these is symmetrical and not polarized? Do you find it odd to say something needs DC but then not indicate polarity on the input terminals?
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"Why does it say "12v DC"?"
Because it does say that.
 
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