[Ti] Comparison of Titanium and WallStreet LCD displays

[ppd]

Greetings all.

I am wondering if I could get your thoughts about the relative brightness 
of the LCD displays of the Titanium and WallStreet PowerBooks. I have 
owned a 233 Mhz WallStreet for a few years now (one of the later 
revisions with an active matrix display). I recently acquired (on loan 
only) a 400 Mhz Titanium PowerBook which I am thinking of purchasing. I 
have noticed that the display of the WallStreet is brighter than the 
Titanium PowerBook. This appears to be the case no matter what 
brightness, gamma, monitor calibration settings I seem to use. The 
Titanium PowerBook display is by no means unsatisfactory, but it is 
darker. I do not have access to any other WallStreet or Titanium model, 
so I cannot compare to others. 

Is it a known issue that the Titanium displays are slightly darker / less 
bright than the WallStreet displays, or is it just the particular units 
that I have ?

Many thanks in advance.

Paul