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.
The sound of loop light 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