My son just rec'd a new Dell U2410.....he now has it next to his old monitor......the 2410 is set to 30% brightness....the old one is at 100% and the 2410 looks twice as bright.
maybe the old display is going dim from old age?
to OP: if you hear a buzzing sound when you get too near your display, perhaps your display has hybridized with africanized honeybees? that might also explain the stinging feeling...
or not :-)