I have designed an anglepoise lamp for use with the popular 12v led bulbs. For the power supply, i have used my trusty 11.1v (3x18650) power bank but any 12v supply is possible.
Power bank :: https://www.thingiverse.com/thing:4177805
In the photo i used a 12w 12v bulb but it was probably too bright.
Have fun. Change the design to suit
Technical
I used PLA for all parts except lamp clamp and shade when i used PETG. Use M3 x 12mm nuts and bolts for each section and superglue the shade to the bulbholder