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The D5500 is quite similar to my D7200 and I found the best ISO for the D7200 was 400.
I found for the D7200 that any ISO over ISO800 did nothing other than decrease the dynamic range without lowering the read noise any appreciable amount.
Now although they are different cameras with different but quite similar sensors, I'd say 200-800 is your best range. I middled that at ISO400.
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