Step 1 : Build Lamp desk footer with grey mortar/cement from a used plastic box in the desired size/aspect. Make a hole in the box where you would need to fix a screw in order to attach the wooden lamp arm.
Step 2 : Take a wood cleat and cut into seven pieces.
Three piece with a length of 4cm to build your bottom “U” which will link your concrete footer and wooden arm.
Three piece with a length around 30cm which will define the main part for the wooden Lamp arm. Make a hole for screw.
And the last piece is the small wood piece where you will screw the metal “U” of the lamp. Glue it with epoxy between two piece (30 cm length piece).