MorganS:
Yes, 5 LEDs in series only consumes 20mA. So you can have many of these series strings on each output. However you must have separate ballast resistors for each string. You can't just tie them all together to one resistor.*Looking at the video, it seems like the tail light switches on in segments that are about 4 LEDs wide. So they have done exactly what you are about to do - 4 strings of LEDs connected to a single output of the driver.
- A resistor may be a poor choice for current regulation in this case. The car's electrical system is at 12V when the engine isn't running and above 14V when it is. With a resistor such as PaulRB recommends, the LEDs will get twice the current at 14V than at 12V.
Ohh, I see .. tpic should be the solution for my problem! I will order them from USA.
PaulRB:
That's true. It may be better to limit your design to 4 LEDs with a 300R series resistor for each group. Then the current will be around 20mA at 14V and drop to around 13mA at 12V.
Ahh, right. I will follow that..
Thank you everyone. I will post an update once I got my tpic and tried the setup!
Oh and BTW. I have edited the original post. I hope you can still help me with it 