C210 PILOT REPORTS CRITICAL CONFLICT WITH HELICOPTER AT NIGHT IN OPF PATTERN.

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CANCELED IFR WITH ARPT IN SIGHT. MIAMI APCH WANTED ME TO STAY WITH HIM FOR ADVISORIES AND HANDED ME OFF AS I WAS ALMOST AT OPF. WAS MONITORING MIAMI AND CTAF; AND ANNOUNCED ENTERING THE PATTERN FOR A L DOWNWIND FOR RWY 30. MIAMI ALWAYS VECTORS YOU OUT FOR A SET-UP FOR ILS 12; BUT WINDS FAVORED RWY 30. NORMALLY DO NOT NEED TO USE RWY 30; SO LESS FAMILIAR. A MIL HELI DEPARTED RWY 27L; AN UNLIGHTED RWY; WHICH IS A BIT CONFUSING. A C172 ALSO ANNOUNCES HE IS ENTERING THE PATTERN FOR RWY 30. SOMEONE (PROBABLY) THE C172 KEPT KEYING THE RWY LIGHTS FOR RWY 12/30 UP AND DOWN. OPF LIGHTS ALWAYS SEEM VERY BRIGHT OR VERY DIM; MAKING IT MORE DIFFICULT TO FLY A GOOD DOWNWIND; REFING THE RWY. THE MIL HELI THEN COMES ON THE RADIO AND SAYS I OVERFLEW HIM. I DID LOSE SIGHT OF HIM. AT THIS TIME I DID SEE AN ACFT BEHIND ME AND LOWER. HE (THE MIL) COMES ON THE RADIO AND JUST KEEPS GOING AND GOING ON ABOUT THE SITUATION. I KEPT ANNOUNCING MY PATTERN CALLS; BUT HE EITHER DID NOT HEAR OR DID NOT LISTEN. THEN I ENTERED AN UPWIND FOR RWY 30 TO SORT OUT THE SITUATION AND ALLOW THE C172 TO LAND. I ENTERED THE PATTERN BEHIND THE C172 AND LANDED. THE C172 EXITED THE RWY AND THE SAME INTXN AS I DID AND CAME TO A COMPLETE STOP. I STOPPED BEHIND HIM AND WAITED FOR HIM TO MOVE. THIS SEEMED TO UPSET THE MIL PLT EVEN MORE. I ANNOUNCED BACK TO HIM THAT I WAS TRYING TO CLR RWY 30 FOR HIM BUT THE C172 BLOCKED THE TXWY. ANYHOW; THE FACTORS TO THIS CHAIN OF EVENTS WERE: DIFFERENT RWY THAN USUAL FOR ME. THE MIL USING AN UNLIGHTED RWY AT NIGHT. I DON'T KNOW WHAT THE CHOPPER DID; BUT THEY DO OPERATE DIFFERENTLY THAN FIXED WING ACFT. THE RWY LIGHTS BEING BRIGHTENED AND DIMMED BY AN UNKNOWN SOURCE (PROBABLY THE C172). THE BRIGHT LIGHTS OF THE CITY; DARK HOLE OF THE ARPT MAKING IT DIFFICULT TO SEE THE HELI. TO IMPROVE SAFETY: I WILL BE MUCH MORE CAREFUL AROUND HELIS AND DOING ANYTHING DIFFERENT THAN ROUTINE. IT WOULD BE GREAT IF EVERYONE USED A LIGHTED RWY AT NIGHT. THE GOOD THING IS NOBODY GOT HURT AND NO METAL WAS BENT. THIS SHOULD BE A LESSON IN BEING CAREFUL AND NEVER LET YOUR GUARD DOWN.