Fairy lights and LEDs

24 December 2013

Interview with

Colin Humphreys, Cambridge University

White LEDBlown fairy lights are a thing of the past since the strings of incandescent bulbs used to bedeck Christmas trees have been replaced by LEDs. Cambridge University's Colin Humphreys explains how they work...

Add a comment

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.