Curious as I'm getting my son a MBP and the screen is just incredible on the new ones. Might get a refurb if it has that great screen.
I believe any versions with 2.2, 2.4, 2.5, or 2.6 Ghz processors will have a LED screen in them. hope this helps! And all of the refurb models on Apple's site have them.
The June 2007 refresh MBP's (introduced the Santa Rosa platform) had LED backlights on the 15" model. It was available with 2.2GHz and 2.4GHz Core 2 Duo processors.