L540 FHD display quality -when dimmed, and at full brightness?

I'm decided on the L540 FHD, 1920x1080. 
Since the L540 FHD is LED-backlit, and potentially different in TN technology,
I'm wondering how it looks compared to a T500 WSXGA+ CCFL,
and also how well the LED backlit looks when dimmed.
     Currently have a T500 15.4" WSXGA+ 1680x1050 CCFL stock display. 128ppi.
     My satisfaction with this display is 8 out of 10.  I regularly dim it to 50% or less at night. 
     Use is 60% firefox browsing, 30% online videos, 10% movies.
The L540 FHD should be just noticably crisper in terms of ppi (141ppi, vs T500's 128ppi).

Given you can show both these issues I would think there will be no problem getting these fixed.
As for timing, one option you have is to take it to an Apple Authorised Service Centre and have then sight the issues they can order in the parts and then call you in when they have them and can do the repairs. This way you can have you PowerBook actually out of your hands for like 24 hours. This is what I do.

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