Passive half-wave rectifier

This seems remarkably useful, and remarkably simple. It’s just two of these circuits, in mirror-image, isn’t it?

Any suggestions for what type of signal diodes and what value resistors to use? Seems like it could easily be built as a DIY in-line thingie, rather than as a panel-mount module.

Now, that’s open for experimentation. Personally I’d make it possible to choose between Si diodes like 1N4148, some Ge diode like 1N34 or 1N60 or some Schottky equivalents and some plain Jane LEDs.