Differences in LED and LCD screen

I would like to know if anyone can actually tell the difference between the LED screen on the 15 macbook pro and the LCD screen on the 17 macbook pro.
I know Apple says there is no difference in brightness or contrast between the two. I believe they only claim there is a difference in battery life. That said even their VERY optimistic numbers show only a 15 minute difference between the two (figure in the real world that may be 10 minutes)
I thought someone had told me there was a very noticeable difference in both brightness and contrast of the LED screen (that it was very noticeably superior)
I can only take two things from this. Either:
1.) It is a placebo effect because they EXPECT the 15" to look better . . .
or
2.) Apple does not want to openly say the 17" screen is not as nice as the 15"
I have note been able to see either, but I am going to purchase this week online and this is a very important factor for me. Can someone please shed some light or opinion on the subject? Does the 15 look better than the 17? When they say LED will last "longer" than LCD, do they mean the half-life of the bulb is longer? etc.
Thanks everyone,
Kalel
Message was edited by: Kalel
Message was edited by: Kalel

Sorry I never know how to refer to the difference between the two. So the different backlighting does help with color, but overall brightness and contrast are not effected?
I have a Macbook and occasionally I have trouble reading it (When my eyes are tired) so I am looking for the brightest screen with the most contrast. I would prefer a larger screen (17) over a smaller one (15) all else being equal, but if there is any contrast or brightness increase in the switch to LED then I am more than happy to give up a little size for it.
It also looks like the 17" may have a slightly higher dpi in it's standard resolution (WAAAY more in the HD res)
Have you had the opportunity to view these screens side by side?
You mentioned that an cfl bulb burns out faster than an LED, I know this is many many years for each, but I would like to know if this will delay the screens "brightness" dropping over time. My macbook is about 18 months old and there has been some drop off in total brightness the screen can produce.
Kalel

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