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Maybe we could dim the lights and have a candlelit discussion of classic literature?

Light Switch 01 is an automated personality operating in the Big MT in 2281.


The holotape to activate this station can be found in the X-2 transmitter antenna array. Light Switch 01 speaks to the player intelligently, but in a seductive tone. She makes innuendos and comments on the player's decisions. The Light Switch 01 Upgrade: Smart Lights can be found on the bottom most level of the X-12 research center leaning against a projecting unit. It appears to be in a conflict with Light Switch 02.

Interactions with the player character[]

Interactions overview[]

FO76 ui icon quest
This character is involved in quests.


Effects of player's actions[]

  • After retrieving the upgrade module for Light Switch 01, the switch can bathe the Courier in "Smart Light", effectively increasing their Intelligence by 2, and their Science and Repair skills by 5 points each. This effect will linger for up to twelve hours, or unless the player activates the "Mood Lights" controlled by Light Switch 02.
  • Without the upgrade module, it is only possible to use the light switch to toggle the normal lights while the Personality Matrices are toggled off at the Sink CIU.

Other interactions[]


There was a dialogue option for Light Switch 01, acknowledging that the smart lights upgrade were found, but it is not present in the game.

Notable quotes[]


Light Switch 01 appears only in the Fallout: New Vegas add-on Old World Blues.


PCPC The "Smart Light" and "Mood Light" bonuses are applied to the player only when the player enter dialogue with the light switch and toggle such light. So, after the light is toggled, when the bonuses passes, just re-entering the Sink and be exposed to the light won't be enough to get the bonuses again.

  • In this case, to get again the bonuses of the light already toggled, it is needed to first toggle any other type of light (even normal light or lights off will work) and then toggle to the desired light again.