Install a two gang box. From each light bring a12. 2. With ground to the box you just installed the two black wires from the light just bend them upto the outside of box Now bring your 110 volt power supply put it in box. Your power supply black wire strip about 1 inch off end of blk wire now make two pig tails out of some 12wire make them about 8 inches strip 1 inch off endof both these wires Now take the feed 110 volt wire and tie the two pig tail wires all together now tie all three white wires together the bare copper tie two bare pig tails to it now you have two blk wires that are bent up they are from the light you have two blk wires that are power supply now get your switch a single pole you will have two screws onside of switch take the power supply blk wire and put it on bottom screw theblk wire from light goes to top screw The bare copper wire goes to green at bottom of switch. The next switch wires up the same
First, you need to install appropriate electrical boxes for the lights and switches. Cut off the electricity supply to your power source then feed non-metallic electrical cable to the double light switch by getting a 12/2 NM electrical cable from the power source. Check out the link for a follow up of the procedure http://www.ehow.com/how_7998577_wire-using-same-power-source.html.
Run your14/2 hot wire to both light fixtures. In both break your ground wire and take a piece of cable and splice into it . Run these to your switch and install on both sides of light switch. Use 14/2 with ground. 12/2 is for plugs on residential.