“One of the problems with my F0 synth was its power indicator LED. It was so bright, you basically couldn’t look at it straight on without being blinded!
There are a couple solutions to an overly bright LED, the obvious being to limit its supplied voltage, but another idea is to use a light pipe: a component that redirects light from one place to another.
Additionally and importantly, it can act as a sort of lampshade, diffusing a concentrated bright bulb over a larger surface area.”