Its for a solar panel with really low voltage that can only produce about 30 to on a sunny day 50 micro amps. Im looking for a led light that would prove that is working besides an amp meter.
Lowest you are going to find is 1-2 mA.
You may be able to use a capacitor discharge method, and there may be IC’s that do that. That is, you store charge in a cap and use that to blink the LED every few seconds.
here is a circuit i found.