Reply to "Surgery on Plastic Lenses for Observation Car Tail Lights"

@TedW posted:

So what do we do to get them to both light?  Red and green, add a resistor to one or the other or…?  Thx in advance.

Run Separate power wires with different resistor values  from your pickup connector or somewhere inside to your Red and  Green LED's. Use this to figure your resistor value needed.

http://ledcalc.com/#calc.

Enter in your DC Input Voltage

Dropping Voltage (2.0 for Red) (3.0 for Green) (3.4 for White)

Milliamps (20)

Number of LED's

Move screen to Right and click on for Series Wiring or Parallel Wiring for whichever you plan to use as if using more than 1 LED  like a Green and White light together it will figure differently (just split the difference of 3.0 V and 3.4 V by using 3.2 Volts power drop.)

Go back to left and hit Calculate for your first color LED, it will tell you below what is the actual resistance, look to the right, it will recommend the next higher value resistor that you should use and the resistor wattage needed, usually 1/8 or 1/4 watt. Write it down, then do it again for the other color resistor, and write that down. Get the correct resistors and make sure you connect positive hot power to the resistor and the longer or positive lead of the LED, then you can connect the return leads to your your return power connector. Good luck with your project.