Converting JPEG files to DNG in Lightroom

Is there any advantage to converting JPEG files to DNG when I import them into Lightroom? I am trying to maintain the quality of the file.
Would it be better to save a JPEG file as a PSD file after I import it to use it in Photoshop and Lightroom?

(Please pardon the change of subject:)
Fred T. said, "If you are editing a JPEG in Photoshop going from Lightroom, let Lightroom create a TIFF. "
I am wondering how to do this. I'm just an amateur and my non-SLR camera doesn't even save RAW images. ("Yup, need to take care of that one of these days.")
My Preferences for "External Editors" (in my case Photoshop Elements 4.0) is set as: File Format: TIFF; Color Space: sRGB; Bit Depth: 16 Bits/component; Compression: ZIP.
When I right-click on a file, and choose "Edit in Photoshop Elements 4.0.app", and pick Edit a Copy from the dialog box, the new file that is created and passed over to PE is a .JPG file not a .TIF file.
I get the feeling that the functionality to create a TIFF, or a PSD, only works if my original image is RAW or DNG. But perhaps I am overlooking something???
Life would be a lot easier if I could send the file to PE as a TIFF. At present, as a workaround, I tell LR to edit the original (so it doesn't create a copy), immediately Save-As in PE as a TIFF so I don't overwrite the original, and then when I'm done editing in PE, save the results (still TIFF). Once back in LR, I have to import the new file.
Any Thoughts?

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The T1i was first supported by Camera Raw 5.4 which is only compatible with CS4 and later
Camera Raw plug-in | Supported cameras
Camera Raw-compatible Adobe applications
Some options:
Upgrade to CS6
Join the Cloud
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Camera raw, DNG | Adobe Photoshop CC

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> When converting RAW (Nikon) files to DNG in LR2, the process never
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function(){return A.apply(null,[this].concat($A(arguments)))}
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Espielle wrote:
…As to upgrading my photoshop CS4 to a newer version it would mean my firstly upgrading my OS Mac system from Tiger to Snow Leopard or newer which at the moment is not an option for financial reasons…
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===
Try Easy Find first, it's totally free, although Find Any File is indeed faster.
===
Finally if you still can't get DNG Converter 7.1 to launch, then download version 6.4, but nothing earlier than 6.4:
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Converting JPEG files to DNG in Lightroom

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