Well i"ll tell you right away. Yes colours on u2311h look a bit warmer but that is not exacty a good thing. You see i find LED backlight much better to work. Whites look much whiter on u2412m , u2311 compared to u2412 looks a bit more "dirty". I"m watching a mostly black picture now and on u2412m it looks a lot cleaner an nicely brighter. U2311 looks like someone spilled mud over it and then cleaned it fast with somthing so it remained a bit dirty. But the bit of brown/yellow-ish layer gives colours a warmer look on u2311h. Difference is small but i prefer watching at u2412m because i like how clean led backlight makes it. There is also one more good thing about LED. Let"s say you are working on a black surface with brightness at 50% on a ccfl screen,it"s nice for yours eyes. Then you open up a white page and it gets bright as fuck, yours eyes start hurting. On a LED screen there is not much difference, getting from a black page to a white page makes not much difference for yours eyes. Even in dark. It"s also easier to look at it when brightness is high. On a ccfl screen getting brughtness up briings tears on yours eyes but in a LED screen it doesn"t. Screen gets a bit brighter and that"s it.