comparing Sony camcorders

[Tom Nugent Jr]

I'm hoping you all can help me with a couple of questions I have 
about the Sony consumer camcorders:

First, I see the TRV22 has a light rating of 5 lux, but the TRV33 (a 
more expensive camera) is only rated at 7 lux.  Why does the more 
expensive camera have a poorer light rating?  (I realized the TRV33 
has other capabilities that are better than those of the TRV22, 
pushing its price up, but wouldn't you expect the lux rating to stay 
the same at least?)

Second, on some of the Sony MiniDV (eg. the TRV22 and TRV33), they 
have what is described as a "Progressive Shutter System" which is 
described thusly: "By using a mechanical shutter with an interlace 
scanning system, the progressive shutter provides a progressive scan 
performance, while the camcorder captures sharp and clear images." 
What the heck does that mean?  Is it progressive scan, or no?  It 
seems to be the system for all the Sony MiniDV camcorders, so I'm 
guessing it is "true" progressive scan, but the description sounds 
funny.  Any thoughts or info?

Thanks!!

  -- Tom