PILOT LANDED AT 7G0 SHORTLY AFTER TWILIGHT EVEN THOUGH THE AIRPORT WAS NOTAMED CLOSED AT NIGHT. HE REPORTED CONFUSION ABOUT THE FAA DEFINITION OF NIGHT.

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THE ARPT LIGHTING AT 7G0 HAS BEEN OUT OF SVC FOR THE PAST COUPLE OF MONTHS. THIS INCLUDES THE RWY LIGHTS AS WELL AS THE PAPI; REIL; AND ARPT BEACON. A NOTAM ADVISES THAT THE FIELD IS CLOSED AT NIGHT. AT APPROX XB35 LCL TIME; I WAS RETURNING TO 7G0 AFTER A LOCAL PLEASURE FLT. SINCE I WAS GOING TO PASS THROUGH THE ROCHESTER CLASS C AIRSPACE; I CONTACTED APCH CTL APPROX 20 MILES SOUTH OF ROC. I ADVISED THE CTLR OF MY POSITION; ALT; DEST AND I CONFIRMED THAT I HAD RECEIVED THE CURRENT LOCAL ATIS INFO. THE CTLR ASSIGNED ME A BEACON CODE AND NOTED THAT LEDGEDALE WOULD BE CLOSED IN ABOUT 13 MINUTES. AT THIS POINT I WAS APPROX 18 MINUTES AWAY PER THE GPS SO I ADVANCED POWER TO HIGH CRUISE AND BEGAN A SHALLOW DESCENT TO EXPEDITE MY ARR. I CALLED THE ARPT IN SIGHT AT 12 MILES AND THE CTLR AGAIN REMINDED ME THAT THE ARPT WOULD BE CLOSED IN A FEW MINUTES AND I WASN'T LIKELY TO MAKE IT. I CONTINUED AND HE TOLD ME THAT LNDG WAS AT MY OWN RISK; GAVE ME TFC ADVISORIES FOR TWO ACFT IN THE VICINITY OF LEDGEDALE; ASSIGNED A VFR SQUAWK CODE AND APPROVED A FREQ CHANGE TO THE LOCAL CTAF. I PROCEEDED AND LANDED WITH NO DIFFICULTY APPROX 5 MINUTES AFTER OFFICIAL SUNSET. LOCAL WX WAS REPORTED AS LIGHT WINDS OUT OF THE NORTH; A FEW CLOUDS AT 20000 FT AND VISIBILITY OF 10 MILES. ACTUAL FLT VISIBILITY EXCEEDED 15 MILES. A NEARLY FULL MOON HAD RISEN AT APPROX XA20 LOCAL. I BELIEVE THE TERM 'CLOSED AT NIGHT' IN THE NOTAM WAS CONFUSING. I HAD INTERPRETED THE WORD 'NIGHT' TO HAVE THE SAME MEANING AS APPLIED TO PLT EXPERIENCE REQUIREMENTS IMPLYING THAT I HAD A PERIOD OF ONE HOUR AFTER OFFICIAL SUNSET BEFORE A CONDITION OF 'NIGHT' EXISTED. I BELIEVE IT WOULD BE LESS AMBIGUOUS IF THE NOTAM STATED 'ARPT CLOSED AT SUNSET.'