Please forgive the less than fantastic images. These were taken with my cell phone. The plant you are squinting at is Phal. mannii v. flava (this plant is for sale - click here), a variety of the species mannii that does not produce the red pigments, most likely a carotenoid pigment, but I'm not sure. If you look closely at the actual flower (in person), you can still see the markings where the red pigments belong. The leaves also are devoid of any red pigmentation.
This is my office window in Baltimore, MD, facing due west. I also currently have there a Dischidia ovata (almost always with buds or flowers), Clivia manata (in the darker corner), Dend. Maiden Charlotte, and a equitant oncidium in the brightest corner for the cold season only - that will go outside at the earliest opportunity.