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Fallout: New Vegas Game Add-Ons (DLC) Hints
Light Switch 02
1 of 5: This light switch is on the wall next to the doorway in the bedroom.
2 of 5: At first, all it'll be able to do is talk to you. You'll need to get its upgrade holotape before it can do anything useful.
3 of 5: Once it's upgraded, you can ask it to turn the lights on, then choose mood lighting to get a 12-hour bonus to your Charisma, Barter, and Speech. (A good thing to do before trading with the CIU.)
4 of 5: After you do that, you can ask it to turn the lights off or return to standard lighting. (This has no effect on your mood-lighting bonus -- only the room lighting.)
5 of 5: NOTE: After you upgrade both light switches, you can get either lighting bonus from both switches. However, you won't be able to have both bonuses on you at once -- choosing the other one will cancel the one that's on you.