The Lux Spectralis
You will need these assembly instructions (13 pages, 1.6 MB) to build the Lux Spectralis from a kit. And then again, maybe you won't. It's not terribly complicated and all the parts are labelled on the PCB (printed circuit board). You will need Adobe Acrobat Reader or equivalent software on your computer to view or print out the instructions.
[Source] The Lux Spectralis