SF340 FLT CREW HAS A LEFT MAIN GEAR INDICATION FAILURE ON APPROACH THAT WAS NOT ASSOCIATED WITH A BAD LAMP. AFTER TWO MISSED APPROACHES AND TROUBLESHOOTING; AN UNEVENTFUL LANDING RESULTED.

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WE WERE VECTORED TO THE FINAL APCH COURSE. AT THE MARKER I CALLED FOR GEAR DOWN; CONDITION LEVERS MAX. WE BOTH NOTICED THAT THE L MAIN GEAR DOWN LIGHT FAILED TO ILLUMINATE. CONSIDERING OUR PRESENT POS AND LACK OF AVAILABLE TIME TO TROUBLESHOOT; WE CALLED FOR A MISSED APCH AND FOLLOWED ATC INSTRUCTIONS; CLEANED UP THE ACFT AND REQUESTED TIME TO RUN THE QRH. THE PNF THEN PERFORMED THE GEAR UNSAFE QRH. AT THAT TIME; DETERMINED THAT THE LAMPS HAD FAILED; SWAPPED LAMPS AND ALL SEEMED IN ORDER. WE THEN REQUESTED ATC FOR SEQUENCE BACK TO THE FINAL APCH COURSE. WE DECIDED TO INITIATE THE GEAR DOWN SEQUENCE EARLY IN ORDER TO BETTER OBSERVE THE OP AND POSSIBLY CONTINUE THE QRH. THE SAME INDICATOR FAILED TO ILLUMINATE. THE PNF CYCLED THE GEAR PER QRH; OBSERVED THAT THE IN-TRANSIT LIGHT FAILED TO ILLUMINATE ON THE GEAR UP; BUT ILLUMINATED ON THE GEAR DOWN SEQUENCE. AT THAT POINT WE MADE THE DECISION THAT THE IN-TRANSIT LIGHT WAS NOT FUNCTIONING PROPERLY; WHICH THE QRH DIRECTED US TO THE EMER LNDG SECTION. PNF CALLED ATC; REQUESTED ANOTHER MISSED APCH; DECLARED AN EMER; AND TO VECTOR US AROUND AGAIN TO THE FINAL APCH COURSE FOR AN EMER LNDG. THE PNF PERFORMED THE QRH; COMMUNICATED WITH THE FLT ATTENDANT AND PAX. BY THAT TIME; WE HAD BEEN VECTORED BACK TO THE FINAL APCH COURSE. CTLS WERE EXCHANGED AND I CONTINUED WITH THE REST OF THE QRH. ON SHORT FINAL; AN ACFT HOLDING SHORT OF RWY INDICATED THAT THE L MAIN WAS INDEED DOWN. AFTER TOUCHDOWN; THE LNDG ROLL CONTINUED UNTIL WE SLOWED TO A SPD WHERE WE EXITED THE RWY ONTO THE DEICE PAD. WAITED AT THAT LOCATION UNTIL MAINT COULD DETERMINE THAT STATUS OF THE GEAR AND THEN DECIDE A COURSE OF ACTION. ALL GEAR WAS PINNED; MAINT TOLD US IT WAS AN INDICATION FAULT; THE GEAR WAS SAFE SO WE TAXIED UNDER OUR OWN PWR BACK TO THE GATE. FAILED TO GET A L MAIN GEAR LOCK INDICATION WHICH WAS NOT ASSOCIATED WITH A BAD LAMP. SUPPLEMENTAL INFO FROM ACN 786167: I DECLARED AN EMER AT THIS POINT AND TOLD ATC WE WANTED TO HAVE VECTORS CLOSE TO THE ARPT TO RUN ALL THE QRH ITEMS REQUIRED. WHILE ON VECTORS I RAN THE EMER CHKLIST; TALKED TO FLT ATTENDANT; AND PAX. WHEN I WAS FINISHED; I TOOK CTL OF THE ACFT AND ASKED THE FO TO DO PNF DUTIES AND CONTINUE THE EMER CHKLIST. THE PROB WAS IN THE RELAY.