Bloom or die, Oncidium sphacelatum!

I've had this plant for about three or four years.  It was blooming when I received it, but hasn't bloomed since.  It's growing like crazy, just not blooming.  It also takes up a lot of space.  I decided to change conditions by exposing it to lots more light.  It spends part of the day in full sun - no shade cloth.  The leaves have turned a much lighter shade of green, with a couple of leaves even turning yellow.  We'll see what happens.  This is one of those situations where research on culture recommendation yields conflicting results.  At Jay Pfhal's site the symbols indicate part shade, while the Bakers  recommend that "Light should be as bright as possible short of burning the foliage..."

We shall see.