Is this LED backlit? With all the good reviews this looks like a good Monitor. Bigger than the 27 inch that Apple sells now. The only thing I am worried about it is that it doesn't seem to be LED backlit? My Macbook 13 inch got in 2007 also doesn't have LED backlit was very bright when I got it, but after 2, 3 years it isn't as bright as before any more.