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12 Volt LED light bulbs

L

Larry B 1486

Member
Picked up some 12 volt 1156 & 1157 LED replacement bulbs. Do the draw less power than regular 1156 bulbs? Replaced one tractors red tail light bulbs and amber flashers with LED bulbs and they are a lot brighter. Just curious about how much power they draw compared to the old bulbs? I know household 110 volt LED's draw just a fraction to what the old incandescent bulb does, 9 watt LED puts out as much light as the old 60 watt bulb. Is this the same for 12 volt bulbs also?
 
Hello Larry B,

I would think the package would have the Info. LED'S need only 5volts. Even if the draw twice as many amps as your old bulbs, whicb I doubt, they are more energy inefficient. Being brighter is a bonus,

GUIDO.
 
The LED's will draw much less than the incandescent. However, some LED 1157, 1156, will have a resistor across the terminals to satisfy the flasher that there is a connection present. It should be noted on the packaging if there is a resistor.

If you are not having flasher issues, it will make no difference as far as the electrical system is concerned.
 
Guido,

LED's really only need about .7 volts to overcome the junction, you put resistors in place to limit the current, no resistor infinite current.
 
The LED bulbs I found at Auto Zone were 1/4 the amps of regularl incandescent lamps. And a lot brighter, without the fragile filament that vibration often claimed.
 
That's another oversimplification. The forward voltage of LEDs varies quite a bit by color. White LEDs are made by taking a short wavelength (usually blue) LED and doping it with phosphors that absorb some of the blue and re-radiate in yellow, red, orange, etc, to create a spectrum that the eye sees as approximating white. The white LED would then have the forward voltage of the original short wavelength LED that it is based on.
LUmex LED color guide showing fwd voltage drop for different colors from this manufacturer
 
Hello David G,

I see most led flash lights with 3 1.5 volt cells, that is about 5volts. As you say though that is irrelevant then? All is needed is .7 volts to bfeak the junction? Works for me.....

GUIDO.
 

A high wattage LED draws more power than a low power incandescent . What is the wattage on the package.
Where a LED really "shines" (pun) is more lumens per watt.
 
Guido,

Big Fred provided a nice clarification on my comment.

A diode has a FIXED forward junction voltage, regardless of current, a resistor must be placed in series to limit the current, or that will essentially go to infinity and burn it up.
 

leds are diodes.. diodes have different forward voltage drop based on types of diodes... ie germanium vrs silicon vrs schottkey vrs galliniumarcide...(SP??)...

AND.... while they (silicon) will "bias" on at .7 volts, they may not be fully on till a slightly higher voltage, typically 1.5 for silicon in full on mode. Throw in the led chemicals and you add more complexity to the mix.

Been way too many years since silicon fundamentals class.
 
I think it is a N or P, NPN or PNP would be a transistor, it has been a lot of years for me too.
 
Very few LEDs today are made with a silicon substrate, but the times, they are a changin', so we'll see what the future brings.
 
I've never checked but they claim a 4" round stop/ turn/ tail LED will draw far short of an amp. I think it was .6 or .06 when they first were coming available.

I tried 1157 LED replacements in my 07 Chevy. The standard bulbs were brighter. I think due to the reflector and the LED not reflecting.
 
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