# Display Amber/Orange on LED Strip with no control module?

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.

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?

• You have the right idea: Since red + green = yellow, just increase the ratio of red to green. A resistor on green will do the trick. Oct 22, 2018 at 15:37
• @dpwilson Even though red, green, and blue are negatives it'll still work? Oct 22, 2018 at 15:51
• What do you mean by "red, green and blue are negatives"? Do you mean 'primary' colours? Oct 22, 2018 at 16:04
• @Transistor The strip has four wires; a single positive wire, and three negative wires that control the color. When I say this, I mean the positive wire goes to the positive on the power source, and the color wires go to the negative on the power source. I'm not the greatest with technical terms. Oct 22, 2018 at 16:07
• Can you give us a current reading from one of the colours? Connect your multimeter on DC A range in series with one of the negatives and record the current. Switch the leads back to the V and COM when finished so that you don't accidentally take a voltage reading with the leads in the current sockets later. Oct 22, 2018 at 17:06