LED is a newer technology primary reasons for introduction is lower power consumption in laptops (CCFL of the past drain the battery very quickly in comparision) and the longer life of the LED itself.
The problem is if you care about color. LED backlight especially in the lower end of the pricepoint have inaccurate color. ACER is known for this, samsung apparenty has a better reputation but it has to do with the design of the LED, it does not generate white light instead it gives off a blueish white which will effect your colors accuracy.
It's actually cheaper to make LED but because of the limited supply it has jaked up the price.
In short LED backlit laptops are good since portability is more important but when it comes to desktop units, color if that is important to you shouldn't be sacrificed and you need to look at the screens for yourself if you can tell.
Also remember backlit can mean edge lit the most common or more expensive backlit where the entire back is being lit. the TV market gave up on this because it was so expensive to produce.
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