I got this riser lighting project done 3/6/2011, (via member Tupalev thread, as I got the Riser lip lighting idea
Since that thread in 2009, I added 1" x 1" alum angle to keep the rope light projected downward, and got rid of the blue painter tape I had on there all this time.
It really made a huge difference.
Total cost: $25 for lights and under $20 for the alum angle, call it $45 total.
I was ready to paint the alum L green, but not needed at all.
It blends in with the carpet fine, and the alum inside helps reflect light down in a safe walking zone.
At full power almost zero light spillage now, its all directed downward.
I filed the corners so they are not sharp, a 2" lip takes the 1" angle nicely with still a lip portion showing.
I got on the floor to show detail here: