Light Bars for Wanhao i3/i3+ (Or other printers!)

Ever find yourself struggling to see your prints in progress? Do you have your printer in an enclosure and want a way to light up the bed? Do you use OctoPi with video monitoring? Then this simple addon is for you!
This project fits any printer that will fit two 210 x 15mm Light Bars!
You'll need to be able to solder.
You will need:

Power Supply (9V 2.1mm DC adapters are cheap to source)
2 x DC 2.1mm Sockets (https://www.maplin.co.uk/p/21-x-55mm-single-hole-fixing-dc-socket-jk09k)
2 x DC