I don't have an LED in a LOTR, but I think when they changed from the previous board system (ie - LOTR) to the SAM system (WPT and up), it allowed something like 14 different 'shades' (single color, different intensities) to be used on the DMD. Since none of their games around the time LOTR was made had factory LED DMD's or the more advanced 'shade' capabilities I imagine they programmed for plasma, so my guess would be it might look kind of funny on an LED just due to the differences in the programming and the way the different display handles displaying the different brightness levels.
edit : wow, insane run on sentence!