There is White LED, usually based on a blue die and YAG phosphor that is terrible for use in LCDs, but it is the most popular for LCD monitors. Truth be told, most mainline monitor makers are running these LEDs too hard, and their lifespan will suffer. Most of these solutions can only cover a portion of the NTSC color gamut- When speaking of this, one needs to also include which standard for NTSC- as there are two. One is really easy to exceed 100% gamut, the other will give you 70% or lower NTSC color gamut. LCD manufacturers are starting to compromise on their color filters to allow more light to pass through the LCD color filters, giving you a nice BRIGHT screen, but with even lower color gamut. An example is OSRAM's OSLON SX.
http://catalog.osram-os.com/catalogue/catalogue.do?act=showBookmark&favOid=000000000000010100010023
Several companies are utilizing RG Phosphors with the blue die in their LEDs for high color rendering. Their efficiency is 50% lower than the White LED- but these LEDs do not get attenuated much due to the color filters, their light is in the "pass" region, and this dimmer backlight gives you brighter results when passing through the LCD's color filters.
Example: OSRAM's OSLON LX LED.
There are the LEDs with Quantum Dots, a "new" nanotechnology, that give even greater color gamut, and narrower Red Green and Blue spectrum, that pass through the color filters even more efficiently. Some of the latest LG TVs have this technology.
Beyond this is a relatively old technology, sightly more costly, using Red, Green, and Blue LEDs. These result in by fart the greatest color gamut, easily the most faithful and true to life color rendering in LCD screens. Unfortunately, NEC and others only use this in their medical and color publishing proof monitors. Last I looked these started at 18,000.00. However, the backlight cost is really only 2x of the white LED solution. Some manufacturers used the color LED backlight with low color gamut color filters in the LCD, and ended up with a solution between the top end RGB LED backlight, and the White LED backlight.
As others mentioned, the unit used to measure the performance is utterly flawed, and these types of sensors need to be calibrated for each of the LCD's color filters and backlight spectrum, independently. Using these X-Rite color measurement units would definitely explain why they had to use their own eyes, as the sensor results are basically bogus.
A proper unit to do comparisons for different LCD monitors with LCDs that have different color filters and backlights with, is called a spectroradiometer. Examples are Konica-Minolta's CS-2000 (the "gold standard" and also a lab standard) or Photo Research's PR-730.