so the blinking only occurs in darkness. Of course, the resistor also has to have a sufficient view of the LED. You might use this as a safety light that only works in the dark. A simple circuit ...

This dead-bug style 555 blinky light is one of those projects, undertaken just to see how small a circuit can be. Pretty small, as it turns out, and we bet it can get even smaller. [Danko]’s ...

Then power is sent to the secondary load circuit that's connected to the bulb ... You can test each blinker to see which one ...