"Sansevieria"
...would you consider putting a high intensity CFL in that floor lamp? That might widen your selection
If you want a wider, taller plant, Norfolk Island Pine will get large eventually, but they grow slowly and also manage OK in lower light -- they will be somewhat elongated and not true to their optimal form, however.
Other young tropical trees like seed-grown avocado will also manage in lower light for a good while though, again they will get somewhat spindly and won't grow optimally -- because they are pre-disposed to grow in the dimmer understory of the mature canopy.
Like any plant, you will need to keep rotating the pot a quarter turn every couple of days or at least every time you water.
Cast Iron Plant - Aspidistra - is another one like Sansevieria.
