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To increase energy efficiency, the lights within the library adapt to the brightness of the daylight outside. Also, the lights automatically turn off in group study rooms that are unoccupied, then reset to half-power once the rooms are reoccupied.
You can push the "II" button on the wall if you want more lighting in a group study room. Please inform a library staff member if you notice that an area of the library does not have sufficient lighting. He or she can troubleshoot this issue for you or create a ticket with the Facilities department on your behalf.