COMMUTER ACFT UNABLE TO HOLD SHORT OF XING RWY AS CLRED. NOTIFIED TWR.

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APCHING BOS TCA WE WERE TOLD TO EXPECT RWY 22L FOR LNDG. ONCE INSIDE THE TCA WE WERE TOLD TO EXPECT RWY 27 FOR TFC FLOW REASONS. ON THE R DOWNWIND FOR 27 ATC POINTED OUT TFC THAT WE WERE TO FOLLOW THAT WAS ALREADY ON THE LOC FOR 27. AS WE TURNED TOWARD THE INBOUND COURSE ATC TOLD US TO FOLLOW THE TFC VISUALLY TO THE RWY; CLRED FOR THE VISUAL TO 27 TO HOLD SHORT OF 22L; AND CONTACT TWR. WE ACKNOWLEDGED WITH THE READBACK. NOW ON FINAL ABOUT 6 MI OUT MY FO WAS RESEARCHING THE DISTANCE REMAINING TO 22L INTXN. HAVING SOME UNCERTAINTY OF THE DISTANCE AND BEING DARK WE WERE NOT ABLE TO VISUALLY IDENT WHERE RWY 22L CROSSED 27. THE LIGHTING OF THE RWYS MADE IT EXTREMELY DIFFICULT. AT THIS POINT; APPROX 3.5 MI FROM THE RWY WE TOLD THE TWR WE WERE UNABLE WITH THE HOLD SHORT CLRNC. HE THEN TOLD A WDB TO CANCEL ITS TKOF CLRNC. APPARENTLY HE HAD JUST BEGAN HIS ROLL. AFTER CLRING THE RWY WE WERE TOLD TO CALL THE TWR TO DISCUSS THE MATTER. WHEN I CALLED; I TOLD HIM BASICALLY WHAT I WROTE IN THIS RPT. IN CLOSING; I WOULD NEVER CONTINUE AN APCH IF THERE IS UNCERTAINTY. SECONDLY; DARK AS IT WAS; THE RWY XING COULD NOT BE CLRLY IDENTED. I THINK IMPROVEMENT IS NEEDED WITH RWY LIGHTING IDENT; AND HOLD SHORT CLRNCS NEED TO BE BETTER DEFINED IN AREAS OF DISTANCE REMAINING AND OPTIONS IN THE EVENT OF A MISSED APCH PROC IN ORDER TO AVOID DEPARTING TFC FROM XING RWYS ARE IMPORTANT ESPECIALLY AT NIGHT.