iv'e done the same thing that ur doing but i mounted 10 to a sheet i plywood cut to size backed with maylar. i bought a roll of 14 or 12 or 10 gage would do. and wired them all together then to a replacment cord. then i made sum with the cut out just bigger than the light it's self so i could mount it to it with a hole in the middle for the cord to come str8 out the back of it. so i could use a a drop light in between the plants