The rise of tiny LED lights may have made this approach practical on a large scale. A different technological approach is IIRC to use surface materials which emit light when there's an electrical current in them.
Drones of any size and aircraft could hide visually with this because it's the shadow that makes even white undersides dark and easily recognizable.
We will likely not see any use in great quantities in the next couple years because platform life cycles and upgrade intervals are long and no major conventional war forces armies to optimise themselves with great effort.
related: Wikipedia article "Yehudi lights", secretprojects forum topic "Yehudi lights"
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