I just now saw this -- I'll have to do a better job of tracking my posts/threads!
I have the 70" 3D edge-lit Quattron from Sharp and I've successfully calibrated it for accuracy and brightness.
I bought the TV in June and immediately noticed red clipping that sent me to research the light source.
White LEDs are actually a blue LED with a yellow phosphor painted on one end of the glass container/lens.
The problem is with the yellow phosphor; not only does it provide relatively weak red spectra, but it deteriorates
over time. There is a huge amount of blue push in the highlights because of this imbalance.
Maybe it is the best that can be had at present, but I find an older Wide Gamut Toshiba with CCFL to be superior
in some colors, though troublesome in skin tones, owing to its blue-shifted green, which enables said wider gamut.
A black body radiator source seems out of the question in this age of energy conservation, but I was a bit disappointed
to find a Quattron lacking in spectrum coverage. The greens, cyans, yellows, blues are spectacular. The red is adequate
for now, but I worry about phosphor decay and the resulting blue picture -- like old lithographed color prints where only
the cyan remains of the original full-color. I would rather believe it is a cartel and that that it is putting out the very best
quality possible than to think that another manufacturer does the white LED better. They are all subject to more or less
of the deterioration, depending on how hot they run and how many photons of blue light strike the yellow phosphor over time...