Note that just because a band is limited edition doesnt mean it will change the scanner color every time or in every park.
Some bands only work in specific parks (Those themed to that park like the HM band). Some only at the entry points (generic LE bands like the new Black Panther one). Some just decide what days to change colors. This morning my Halloween 2017 band flashed orange at the MK entrance. Thursday it just went green. My Pandora band only changes colors at DAK, but only went green on Saturday. A Star Wars band from 2 years ago has always had the special effect in Studios. New bands (if you were to purchase one while you are in the park) often don't have the effects turned on for several days after release.
LE bands are fun - I think 15 of mine are LE - but don't count on them working every time