Airbus A320 Cockpit Tour: #28 - Lights Panel: What do all those buttons do?!

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In this segment we will discuss the Lights section of the Airbus A320 Overhead.

(1) OVHD INTEG LT knob
This knob turns the overhead panel’s integral lighting on and off, and adjusts its brightness.
(2) ICE IND  & STBY COMPASS sw
This switch turns the standby compass light and the external ice detector light  on and off.
(3) DOME sw
The DOME sw controls both dome lights.
The DOME sw can have one of the two following configurations:
or
BRT : Both dome lights are on and bright.
DIM : Both dome lights are on and dim.
OFF : Both dome lights are off.
(4) ANN LT sw
The ANN LT sw controls all the flight deck annunciator lights.
The ANN LT sw can have one of the two following configurations:
TEST : All flight deck annunciator lights turn On.
The figure '8' is displayed on all Liquid Crystal Display (LCD) of the FCU.
DIM : Reduces the brightness of all flight deck annunciator lights.
BRT : All flight deck annunciator lights operate normally.
Note: When the ANN LT sw is set to TEST, do not reconfigure the DU (ECAM/ND transfer)
or the DMC (DMC switching).