It is AC Adapter / Power supply / charger box good to build new one or repair old broken one if you have. basically it was build for wang ac adapter for the lamp but can be use in so many applications box size is as bellow This thing was made by www.3DARts.ca
out side dimension 72 x 52 x 45 mm
inside dimension 61x48x38mm

also you can buy wang 12vac 60w ac adapter for your lamp as bellow
If you do not want to make its available to buy direct online at www.azsurplus.com

after print you just need 4 screws (3mm M3) and cable fasteners please see our other items uploaded on thingiverse to get cable holder/faster that you need to print twice. that also need 1x 3mm screw with nut for each cable holder
http://www.thingiverse.com/thing:915737