Interesting question.
I know there's a big push for white LEDs at ultra high output. Right now they can only get them good on a small scale (not enough Lumens for a projector). The problem is usually the blue LEDs in an RGB setup, or that the color temp is skewed towards red and green in a single-source (i.e. projector lamp) setup.
However it is coming, and they are making big strides. The uses in flashlights (already available and getting better), projectors, car headlamps, and new display techologies would be vast.
But I wouldn't reserve a spot on your wall for one just yet
