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.
For any G5, just bend the lamps until it's over the screen.
Wrap some masking tape over the lamp arm before bending, so there won't be scratches.
Dry fit the mounting plates before gluing.
Idealy, lamp should be flush with the framing.