Ive got a big ficus retusa under 300W MH light over the winter. Altough it grows well with short internodes, I keep it outside most of the year when the temperature lets me to do so. It grows much better outside, gets more air, backbuds a lot late summer which it does not do inside for me.
All plants belong outside. If the climate does not allow you to keep it outside, then you should try to make a good eviroment for it. Otherwise it should be kepst outside.