I have a set of LED strips that have the following four wires:
- Positive
- Negative
- Red Channel
- Blue Channel
- Green Chanel
Given these wires, I can produce the following colors without additional components:
- Red
- Blue
- Green
- Purple (Combine red and blue.)
- Cyan (Combine green and blue.)
- Yellow (Combine red and green.)
- White (Combine red, green, and blue.)
However, the control module (now fried due to a crossed wire) has an option for amber/orange. The question is, how can I produce this color? I believe I may have to combine green and red to produce yellow, and add a resistor or similar to the green channel to reduce the current to that color thus displaying more red and possibly producing the desired color.
Additional Details
- The lights are powered by a 12v source (car battery).
How can I use the above to create an amber/orange color from the lights?
If the answer is simply adding a resistor, what is the lowest resistor I should use in the 12v circuit?
Answer
The resistor value you want will vary based on the amount of green you want, or the amber in general you want to see. It's safe enough that you can try a bunch of resistor to figure it out. Anything from 10 ohms to 500 ohms should be enough. You can put it on the negative side without issue.
Amber is, in rgb hex values 255, 191, 0. So green is roughly 75% of full brightness. Reducing it just a bit should help produce a nice orange color.
Once you found which value works best for you, measure the voltage across the resistor, and using ohms law, you can find the wattage needed for the resistor. P = (V^2 ) / R or V * I. The more current your led strip uses the higher wattage resistor you'll need.
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