The Notebook Review forums were hosted by TechTarget, who shut down them down on January 31, 2022. This static read-only archive was pulled by NBR forum users between January 20 and January 31, 2022, in an effort to make sure that the valuable technical information that had been posted on the forums is preserved. For current discussions, many NBR forum users moved over to NotebookTalk.net after the shutdown.
Basically they are just different backlighting technologies for the LCD screen. In the case of the 1537 screen, the manufacturer of the LCD uses Light Emitting Diodes to light the screen and in the case of the 1535, it uses the older Cold Cathode Flourescent Lighting technology. The benefit of having an LED screen is simply to save (a little more) power than the CCFL. If the relative cost between the two similarly configured machines are too great, I would probably opt for the less expensive of the two. If the difference in the price isn't too great, I would just get the LED since it is nice to have new technology.
Problems? See this thread at archive.org.
