A lot of lighting fixtures are fitted with iec outputs to daisy chain from one to the next. However, the cables are hard to find locally. These were a great price and above all short and light weight- perfect for LED fixtures..they work great.
I had a situation where I needed two power cords ~10' long for monitors. The existing cords were 6' long. I had a choice of purchasing two new power cords or two extensions. The price was roughly equivalent in both cases. The decision to purchase extensions rather than new cords was driven by the fact that I would not have to store the existing cords. Plus I did not have an alternative use for the existing cords.
The extensions work perfectly. As usual, I am very satisfied with my purchase from Monoprice.