Working on my first grow room and read about light rails... then got the sticker shock a trip to mclendons and $20 later and tada took a four foot piece of pvc and put a welded up bar over it (this one was a corner for tarps, I'll probably make a better one later) I used u bolts to hang it from the ceiling and put end caps on the pvc to make sure it wouldn't come loose I wouldn't trust it to hold an overweight diy hood but for now It'll do
the metal part that the light hangs from slides back and forth on the pvc Not an auto light rail, just something I can move around though out the day