Luck and Items (and using luck to get items)

My question is this:

Does it help to cast a Fortify Luck spell to increase the chance an
ALREADY SPAWNED enemy will drop a good  item (lets say a nice daedric
chestplate)? -- or does the game automatically decide what items the
creature will drop as soon as it spawns (making it worthless to cast the
luck if I the items are preset)?

Thanks,
    Zach


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