A while ago I made some Fairy Light Globes. 100mm Glass Christmas ornament globes with a Fairy LED Light String in them. I display them in groups of three in two places in the house. Recently I touched the power supplies – Wall Wart supplies producing 3.5 Volts – and noticed that one of them was warmer. Odd. All the light strings were bought at the same time. I got out my FLIR thermal camera and this is what I found.
One of the globes is hotter then the others. Using a KillaWatt measuring device, I found that the warm globe is drawing 3 watts, and other others don’t draw enough to move the value from zero. So this is what is making the power supply for that globe warmer. I have swapped the power supplies and the globe – Fairly Light String actually – is different, not the power supply. Odd. I have no idea why.