After we had exchanged 4x the Bauhaus lamp (because after a short time always defective), we have for another - searched solution - better. And Amazon is found (almost) everything. Lamp came very fast, straightforward attachment to the loft bed - and it works flawlessly for over 6 months!
Addendum of 12/29/2013: Still works properly, is attached to the loft bed, is used daily! Therefore unlimited purchase recommendation!