File Size - Photoshop With LR or Bridge

When I open files from LR (Ctrl-E) in Photoshop, LR immediately creates a .tiff file approximately 5 times the size of the original DNG. Then it quadruples in size again when it is converted into a Smart Object.
Here is what I did:
From LR Ctrl-E (ProPhoto,.tiff,16-bit). In PS Convert to Smart Object. Save File and the size went from 9.73mb to 175.6mb.
From Bridge, double click on the same photo. In ACR choose Open Object. In PS Convert to Smart Object. Save File and the size went from 9.73mb to 95.1mb.
What is going on here? Is there some benefit to having files twice as big for what appears to be the same result in the image?

I checked, both are 16-bit.
It appears that an unflattened image processed from LR is much larger than when the same image is processed through Bridge. For example, a 9.5mb DNG becomes a 216.5mb image after Curves, Levels, and Unsharp Mask when processed as a Smart Object in PS. The same file processed with the same adjustments through Bridge is 139.4mb.
Once the image is flattened, there is little difference in file size whether processed in LR or PS.
For my work flow, it seems appropriate to commit to the adjustments, flatten, reduce the image size, and convert to 8-bit. The 216.5mb file then becomes a 5mb file. For the rare occasion that I want to reprocess a file, I just have to do it all over again starting from the DNG. This defeats the main benefit of being able to tweak the adjustments using Smart Objects, but my storage demands are greatly reduced.
For those really rare times when I have a large investment of time adjusting an image, it makes sense to process is through Bridge and save the large file. However, I can see no benefit to opening such an image from LR and ending up with a file twice the size.

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We write a newsletter for our daughter's gym and are trying to export a Pages '08 document into a PDF small enough for e-mail. When we export with Best settings the file size is 3.2MB, with Better the file is 4.1MB and with Good the file size is 3.8MB. Why would the lowest quality setting (Good) result in a larger file size than Best?

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How to optimize file size when opening RAW in Bridge?

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J Maloney wrote:
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> He says it's probably better to build the whole thing in PS at around 150dpi
Leonie,
For future reference, it's a matter of common sense. Generally speaking, the larger the final output format, the lower the raster resolution. Think about it this way:
Why are things printed big?
Because they are viewed from a distance.
Why is 150-300ppi the conventional-wisdom rule-of-thumb?
Because 150 lpi halftone ruling is a very common halftone screen for process printing viewed at (at most) arm's length. 150ppi means that the square raster pixels are at least as small as the halftone dots, so their square shape won't be evident (in other words, you won't see "the jaggies.")
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We are seeing an odd form behavior and have isolated the apparent trigger to something we are doing in the form script. I'm hoping someone can confirm they see the same problem, details follow:
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Acquisition system.png ‏177 KB

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null

Robert Petuker (guest) wrote:
: Hello all,
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null

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