yes - as it is, it seems we may change the parameters independently, but the results do not suggest we have a "3d ellipse" - I was trying to put some lights inside a tall picture frame/cabinet (under left/right frame), but I learned that I can only do it by stacking a number of very dim lights... or at least that was the only solution I found - the problem is I got 16 lights under a glass and it takes considerably longer to render.