Find all your DIY electronics in the MakerShed. 3D Printing, Kits, Arduino, Raspberry Pi, Books & more!

David writes in -

Here’s page & description of how LED Christmas lights work. I found this site while searching for a way to repair a string of LED lights. This answered a lot of questions I had, like why the LED lights flicker, and why there is no obvious transformer or voltage converter in the string.
They also have a page on incandescent Christmas lights and how to troubleshoot/repair them.

LED Christmas Lights and how to fix them – Link.

Phillip Torrone

Editor at large – Make magazine. Creative director – Adafruit Industries, contributing editor – Popular Science. Previously: Founded – Hack-a-Day, how-to editor – Engadget, Director of product development – Fallon Worldwide, Technology Director – Braincraft.



  1. Anonymous says:

    Wow! The authority on led christmas lights here folks….

    Good read however.

  2. Anonymous says:

    I too have the exact same phillips LEDs. The blinking is enough to make me nauseous if it is the only source of light. There is however a solution! The Sylvania LED Micro-Style Lights (purchased from BJs) have some kind of phosphor like effect, when you pull the plug the glow slowly dies over the course of 20-30 seconds. As far as I can tell these lights have no discernible blinking effect.

  3. Anonymous says:

    what an awesome reference. Thanks for sharing!

  4. frank says:

    Hmm, Usually LED Christmas lights needn’t to repair. It’s green and with long-span life.

  5. LED christmas lights are energy efficent and i also prefer LED christmas lights.