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I just wrote to HD and asked how can I get red, yellow & orange spare bulbs. Hopefully I'll get some kind of a reply.
How is LED Christmas light string wired with 4 wires ?
- Thread starter Chuck99
- Start date
Do you have a variable power supply (PS)?
You can characterize the LED to see what you have?
Set PS to 0V attach LED any polarity will do.
Slowly adjust voltage upward watching for LED to illuminate and monitor current with PS or meter.
Stop when you get to 20mA or about 3.5V.
Reverse connections to LED and repeat.
You can repeat using other colored spare LED.
This will tell us if the LEDs are colored or whether they are white LEDs with tinted encapsulation.
Also whether they are bidirectional or unidirectional.
I am referring to the new LEDs.
You can characterize the LED to see what you have?
Set PS to 0V attach LED any polarity will do.
Slowly adjust voltage upward watching for LED to illuminate and monitor current with PS or meter.
Stop when you get to 20mA or about 3.5V.
Reverse connections to LED and repeat.
You can repeat using other colored spare LED.
This will tell us if the LEDs are colored or whether they are white LEDs with tinted encapsulation.
Also whether they are bidirectional or unidirectional.
I am referring to the new LEDs.
I do not have a variable power supply but know someone who does.
I'm going to try to get together with them but it may be a while.
I'll report back.
You could also go with simple AA batteries. Start with 1 battery (1.3-1.5V), then 2 batteries (2.6-3.0V) and then 3 batteries (MAX) giving 3.9 - 4.5V. All LEDs should illuminate with 2 batteries, even White might glow some, but you may need to go 3 AA's to get 20ma on a White LED. For safety you could include a 100 ohm series resistor for protection, especially at higher voltages.
