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Decorational lighting used around the holidays.

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Holiday Time LED C7 2-Color Lights Replacement Bulbs wrong color

I had a LED bulb with broken contact wire. After replacing the bulb it lit blue when the rest of the lights lit white and the white when others were blue.

This is a color changing set Blue and white. My first effort was to turn the full set off and then power on with setting at #1 Steady Blue. I then tried the same with setting #2 Steady white. Same result: the one bulb was opposite color from the rest.

Next I tried swapping the problem bulb from first half of string (1st circuit) to second half (2nd circuit) The problem bulb remained opposite in color. I tried variations of swapping while string powered on and when powered off. Same result.

Next I tried replacing the entire 2nd circuit bulbs (25 bulbs) I ended up with 25 bulbs on white (2nd circuit) and 25 bulbs on blue (1st circuit) Because almost all of my replacement bulbs came from a string of 50 lights with severe wire damage (multiple cuts and breaks) I concluded that a single replacement bulb was one state or another and was at a condition opposite the state of the original bulbs. I dubbed a bulb either State #1 or State #2. Therefore in a string is full of State #1 bulbs replacing one with a State #2 bulb would have the effect that I am observing.

Am I wrong? Is there a way to flip the state?

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Hi @dj1958 ,

Did you try just reversing the Blue and White wiring connections to the one LED, or inserting it in the other way?

Dual colour LEDs usually have 2 inputs and a common anode, e.g. in your case a Blue input lead, a common anode lead (usually in the centre of the 3 leads) and a White input lead.

Here’s an image to show what I mean.

Imagine that the lead on the left of the LED is the Blue input, the centre (being longer) is the common Anode lead and the lead on the right is the White input

Block Image

(click on image to enlarge for better viewing)

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These bulbs are 2 lead LED and color change is made by reversing current I found the answer by experimentation with spare bulbs and removing the LED bulb from its plastic holder and reversing the bulb (turning 180 degrees) and reinserting in holder. Youre answer is closest to the truth


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