A B757-200 CAPT REPORTS MISSING AN APCH LIGHT INOP NOTAM NOTICE AND FLYING AN ILS TO CAT I MINIMUMS WHEN INOP APCH LIGHTS REQUIRED A HIGHER MINIMUM.

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I TOOK OFF FROM ZZZZ AND FLEW TO ZZZ. UPON ARR AT ZZZ AT APPROX XA45 HOURS; THE ATIS WX WAS REPORTED TO BE OR INCLUDE VISIBILITY OF 1/2 SM. BEFORE STARTING AN ILS CAT I APCH TO ZZZ; THE WX (ON A NEW ATIS) WENT DOWN TO 1/4 SM. RVR WAS NOT INDICATED ON THE ATIS; BUT THE FLT CREW ASKED BOTH APCH CTL AND THE CTL TWR IF RVR WAS AVAILABLE. IT WAS. TOUCHDOWN ZONE WAS REPORTED TO BE 3500 FT; MID RVR WAS 4000 FT; AND ROLLOUT RVR WAS REPORTED TO BE 4000 FT; ALSO. CAT I MINIMUMS WAS 1800 FT RVR. WHILE ON APCH; WE (THE CREW) SAW APCH LIGHTS; HOWEVER; AFTER LNDG; THE CAPT (ME) NOTICED IN THE NOTAMS; INCLUDED WITH OUR WX PACKAGE AT ZZZZ; INDICATED THAT THE ALS WAS OTS EXCEPT STEP 3. I ALSO NOTICED THAT CAT I ILS MINIMUMS WITH ALS OTS (OUT OF SVC) WENT UP TO 4000 FT RVR REQUIRED AT TOUCHDOWN. WE HAD 3500 FT RVR; SO I HAD AN OVERSIGHT ON MY PART. WE DID HAVE AN ALS; HOWEVER; IT MAY BE THAT IT WAS PARTLY NOT ACTIVE AT THE TIME OF OUR ARR. IF NOT; THEN WE MAY HAVE SHOT AN ILLEGAL ILS CAT I. WE LANDED WITHOUT INCIDENT. LIKELY CAUSES; ALTHOUGH THERE WAS A FLT CREW OF 3 PLTS; FATIGUE MAY HAVE CONTRIBUTED; AS WELL AS THE FACT THAT I MISSED THE NOTAM ABOUT THE ALS OTS FOR WHEN I REVIEWED THEM BEFORE TAKING OFF.