I have a program that does cover my lower back and legs.
However, even tho the electrodes can be programmed to cover the lower back area, doesn't necessarily mean it will alleviate the pain in lower back.
Depending on the source of the lower back pain (ie: disc degeneration vs. muscle pain)....
I find the stimulation to be quite soothing for muscle pain in that area, however, since I have degeneration issues going on in my lumbar spine, the stimulator doesn't really cover the type of pain that this generates since it is more of a 'bone pain' thing.
Sometimes the stimulation in the lower back actually irritates the pain.
It just kinda depends on what 'mood' my back is in on any given day