converting a CCFL panel to use an LED backlight is going to produce worse results than using a CCFL tube. CCFL is hands down the best backlight method available in terms of color quality. the difference in battery life is 1~2W per hour and easily compensated using an SSD instead of a mechanical hard drive.
if you're going to mod an X200, use CCFL. if you need an LED-based display for better battery life then buy an IPS X220 and enjoy it.
my two cents.






