Light Switch 02 speaks to the player in a seductive tone and makes comments on the player's decisions. She is also in a rivalry with Light Switch 01, referring to her as "that frigid little ice queen".
Once the player retrieves the upgrade module, Light Switch 02 can bathe the Courier in "Mood Light", increasing their Charisma by 2 points, and their Speech and Barter skills by 5 points each. The effect lingers for 12 hours after initial exposure, or until the player activates Light Switch 01's "Smart Lights".
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.
PC 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.