RAT5,
There is a CAT I equipment with DH ~550 ft. That is a funny one as well: for categories B, C & D the DA of the LOC approach is
lower than with ILS CAT I. (In fact the ILS CAT I DA is even higher than the DA of the VOR approach).
I have no idea where the RVR of 450 m for the CAT II is coming from, as this is clearly not enough: When an aircraft reaches the DH of 233' (best case scenario for a category A aircraft), the distance to the threshold is (233-54)*0.3048 / tan(3º)= 1041 m.
Since there are only 420 m of lights before the threshold (IALS), even a RVR of 550m would not be enough, since 420+550= 970 < 1041
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