what does your current FCOM say in this section?
OVERHEAD PANEL
Ident.: PRO-NOR-SOP-06-A-00011155.0001001 /
Applicable to: ALL
WHITE LIGHTS ON THE OVERHEAD PANEL
During the scan sequence of the overhead panel:
* ALL WHITE LIGHTS...................................................... .................................... EXTINGUISH
It is a general rule to turn off all the white lights during the scan sequence; therefore, these
actions are not listed here
you instructor is probably just getting the plane set up for the next crew