24" iMacs (2009 model) - do they use LEDs for backlighting or the venerable CCFLs?

[Deja Q]

If the latter, by the time the 2011 iMacs come out, those WILL use LEDs and I'll get a high end one then... LEDs last so much longer and are greener than CCFLs... but I do know they are expensive anyway and the 24" iMac monitor is a true winner in every sense of the word, even if it uses a CCFL... (the Macbook pros use LED lighting and are worth every penny...)