Flying an ILS down to 200 feet might not be a very good idea, as 200 feet is the system minima for a cat 1 ILS to which should be added a correction for altimeter error with the aircraft in landing configuration ( position error ).
Many light single engine aircraft and some twins don't quantify this error in the POH or AFM, and the recomendation is to add 50 feet to system minima for a precision approach.
Thus even for an IR holder in current practise DH in a light single should be 250 feet, not 200.