Almost three months ago we set out to answer one of the most common questions that we get at paper circuits: How long do LEDs last?
Using the proper scientific method, Lianna set up a row of all five colors of LEDs continuously powered by a single coin cell battery. We all made our predictions whether they would last for days, weeks, months or years. We were actually about evenly divided between the four options.
Green was the first to die after more than two months of continuously being on! I took this picture on September 23rd when I couldn't see any more of a glimmer from the green light.
Today we've reached the three month mark and I can still see the white and blue LEDs lightly shining and a tiny speck of color in the red and yellow. Its interesting that the red, green, and yellow take all the power if they're in the same circuit as the whites and blues (more resistance?) and they were also the ones that went out first.
Either way, 2-3 months is pretty good for a single battery running a light. And who knows how long the blue and white lights will stay lit? Legend has it that a dinosaur bling (with blue light) that Fan made at the tinkerer's ball stayed lit in her desk drawer for over a year!