it works with an battery powered led simple handlamp wich is screwed in an acetylen bottle safty cap wich i had leftover from another project.
all the other parts are scrap wich i´ve found in an metalrecycling container.
the parts are screwed together or stick with epoxyd glue.
the lamp makes enough light for the desk and you can´t see it when not switched on.
you can also use it as an nightlamp on the floor for example.
hope you like it.