Light pipe is great for decorative applications, you could even sew it into an e-textile project. It's also a good way to 're-route' an indicator light that's buried inside an enclosure, so that it's visible on the surface. Putting different colored LEDs at either end produces some very cool effects as well!
This is a 5 foot length of 3.5mm diameter light pipe. This light pipe has a white core that reflects light out and makes it visible in slightly brighter conditions. It can be easily connected to a basic 3mm LED with a length of shrink tubing or some tape.
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