Hi Susan,
You can find vertical and horizontal strip lighting from within the ROOM_FUR catalog. Go to Room_FUR > Lighting Fixtures > Strip Lighting > then you can use the vertical light. Keep in mind that you can add the strip light in either the Floor Plan or Elevation but you can only make the light longer from within the Elevation.
In the Elevation, left click on the strip light and you will notice 2 green points, one on either end of the light. Left click and hold one of the points and you will be able to stretch the light as much as you need.
Hope this helps out!
Kris