1157 LED question

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Thread Starter


Joined Dec 26, 2008
It seems like it would be easy but I just can't figure out how it would work out.. long story short how do you get a dual brightness using a 3 LED on a star board using a 700 mA LED driver?

here's what I can only think of right now.. OK so we know the LED driver is going to supply 700 mA from the whole voltage range it's rated for..

Ok So what happens if you put a resistor on the output of the driver? is that how I would get my dimming?

it's for a car's turn signal/parking light.


Joined Jul 17, 2007
Hello 1-3-2-4,
Yes, it does seem like it would be easy, which is the problem.

It's anything BUT easy, which is why we no longer support automotive modification topics, particularly safety items such as lighting modifications.

There are far too many variables for a hobbyist to keep track of, and a hobbyist has no way to test and ensure that the color, brightness, angles, etc. are in accordance with applicable laws and safety standards, and there is no way we could even assist you with it; we're not automotive engineers.

Our Terms of Service has this clause in it:

6. Restricted topics. The following topics are regularly raised however are considered "off-topic" at all times and will result in Your thread being closed without question:
  • Any kind of over-unity devices and systems
  • Automotive modifications
  • Devices designed to electrocute or shock another person
  • LEDs to mains
  • Phone jammers
  • Rail guns and high-energy projectile devices
  • Transformer-less power supplies
So as you can see, these kinds of topics are simply not supported.

By the way, even if you DID managed to get it working, it's most likely that your flashers/turn signal blinkers would no longer function, as they require a certain amount of load in order to work properly. Also, if your ECU monitors your bulbs, you will get a constant "Bulb out" notification.

I urge you to keep your vehicle configured the way it was when it rolled off the showroom floor.
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