I know there're USB lamps from LEDs for laptops, but I need one right over the screens.
so here are hacks for G4 iMac and a Intel.
... don't know exactly what model name this IKEA lamp is ...
For the G4, unscrew the bottom plates & remount the lamps backwards.
Take the mounting plate & glue it to the iMac
I tried Velcro & double-side tape, but both are not strong enought.