Very dim screen on MacBook Pro - how to prove it?

I bought an MBP about 4 weeks ago (just before the new rev came out, so this one does not have LED backlight) and have mostly been using it connected to a 23" cinema display.
When I was using the built-in screen the other day I realised it was very dim even at full brightness, with very narrow viewing angles, dark corners, and a noticable brightness continuity down the left hand side.
Now the shop I bought it from doesn't have any 'old' MBP's to compare it to, but comparing it to my 4 year old Thinkpad it's clearly substandard, and to my eyes it's bad enough to be defective. The shop on the other hand say it's 'normal' but suggested take it to an apple service center to get it tested.
So, does anyone know what the actual specs for light output (lumens) of a CCFL-backlight MBP are? If I don't have that number, how can I best persuade Apple that this screen is defective, and not get fobbed off with unprovable claims that it's 'normal'?
Many thanks for any advice.
Matt
MacBoook Pro 2.33C2D   Mac OS X (10.4.9)  

Re-install the OS from the original DVD supplied, boot holding down c to force the disc start up.

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