Did you hear that? This article refers an upcoming content that has yet to be implemented. The content may be changed over time based on the progress.
Turns out some or all of the lights
Lights-Off is one of the random events that will be added in .
Baldi's Basics Plus
When this event happens, some of the lights will be turned out and will make it harder for
the Player to know if Baldi is right behind them.
The hallway in
Baldi's Basics Classic that introduces this concept.
The lights out event as seen in the
Baldi's Basics Plus early access trailer.
This event was first revealed in the game's Kickstarter description, and was introduced in  from one of the Baldi's Basics Classic hallways for update V1.4 as a concept.
The event is not included in any demo nor the current version of Baldi's Basics Plus.
The Test's blindness effect could be similar to the Lights-Off event.
In the Baldi's Basics Plus early access trailer, a more finalized version of the lights out event can be seen due to the inclusion of the new lighting system.
 It was possible that this event would be added to update V0.2, but the Gravity Chaos event was added rather. Instead, it might be included in a future update.
It's possible that due to the similarity to The Test's blinding ability that this event will not be implemented, but this seems to be unlikely.
The sound of the looping buzzing noise found in the dark hallway in Baldi's Basics Classic.
Some examples include all the lights going out or Baldi breaking his ruler so he can't be heard. There's even a party event where an awesome item will spawn in a room." - Kickstarter page description ↑