I have never used Giessman but built in moonlights are really nice, especially if you don't want to install them separately. Not sure if that's worth $500 though :-) Depends who you ask I guess. I would probably say "no" if you were asking me :-)
Aside from the moonlights both fixtures get great reviews. Also keep in mind that replacing four 80watt T5s is going to be more expensive than replacing four 39 watters.
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