Updated thanks to an error found by jbidinger, thank you!.
the pulley wheel must be mounted to rear of the X-gantry to have full movement of X carriage. As such I made a new version c which has a cut away for the mounting plate on the rear.
Here is a light bar you can mount to the rear of your X gantry with 2 T slot nuts and screws.
I used this light roll: http://a.co/2jMP1eH
cut at smallest interval that is indicated on the roll. You will have a lot left over that you can use with any 12V source.
I then wired it to the rear of the Power Supply, positive lead goes to the V+ lug and negative to the COM.
I added a switch in the middle that I screwed to the side of my control box.
I am including my files to the switch.
I used this part:
5pc OLS 12V DC 30A 3-Pin SPST LED On/Off Rocker Switches - BLUE
or you can print this control box with built in switch placement:
you can use with this switch housing:https://www.thingiverse.com/thing:3315172
If you make one please let me know, and post your photos.