A Midnight Zone.
A Midnight Zone full of light because the player has eaten enough plankton or 1 Lightbulb to emit light, while playing as Eddie.
Midnight Zones are sometimes encountered in Edie levels. There's nothing to emit light except for: Eddie, the intruder while playing as him, Plankton and Lightbulb. Eddie will emit light for some time before doesn't emit much light, but can eat Plankton or Lightbulbs to emit light again. No other fish can light the area.