JPG's from Lightroom vs Bridge... file size difference.

I'm a Photographer. I only shoot in RAW. I use CS2 and Bridge to process my RAW files and then export the finals to JPG.
I heard the buzz about Lightroom and downloaded the trial to give it a whirl. I have since upgraded my trial version to full version (via serial number) and then took a set of RAW files that were already tweaked (via Bridge/ACR), copied them to another folder (with the xmp side car files), brought them into Lightroom and exported them to JPG. The JPG's created by Lightroom were MUCH smaller. I was very surpised by this.
I shoot with a Canon 20D and the JPGs generated from Bridge ending up being between 4 to 6mg per image. For the same set of RAW images, the JPGs generated from Lightromm avereaged between 1.5 and 3.5 mg. Both Lightroom and Bridge were set to export the JPGs at the highest quality.
Can anyone tell me why this would be? Has anybody else found this to be the case? I can't help but think that some data is being discarded from Lightroom.
Lou
http://www.steadfastdesigns.com
Rochester, NY Wedding Photographer

Did you choose export metadata to file first? The edits made to RAW images are contained within the database as well as xmp files if you choose this option. The edits for all other formats are embedded within the file (as well as the database) but of course you have to choose the export metadata option first. Your files may be smaller because they don't contain this data.
The image quality settings are not like for like across the Adobe range so cannot be compared.

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