This little clamp will allow you to attach this incredible IKEA Cabinet Lightning to your Mendel. The current configuration is for M8-Rods as used in my Prusa Mendel, but the scad will allow you to adapt to other sizes.
IKEA Part Number: 701.807.62 INREDA Cabinet lighting
The lamp comes with a 12V power supply (but no power cable...) that you won't need since your power supply most probably provides already 12V.
The lamp has a line of almost 20 LED of a warm white color, it's ideal to have no shadows where you are printing.
The next version of this thing will have a little hook to catch the cable.
Print two of them, clip it, done !