[newsomix9xl]

The grow lights are only needed at night.

You can leverage a sunny window for free.

I would have liked a more how many plants can do it, rather than the its impossible route.

AI says a snake plant and spider plant can produce oxygen night & day. Now assume I live in a tiny hovel (kinda true) how many plants do I need for "net oxygen surplus" (?)

Apparently, AI says, high yield crops of say wheat under intense LEDs or Spirulina make for optimal oxygen producers.

So 15 m^2 of spirulina in an aquaponics garden with intense led fixtures to supplement natural light might do it.