FO OF AN LGT ACR ACFT MADE A HARD LNDG RESULTING IN AN UNSAFE MAIN GEAR LIGHT AND A GAR FOR A SUBSEQUENT SUCCESSFUL LNDG.

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LAST FLT OF A 5 LEG; 12:21 HR DUTY DAY. WX; NOT FATIGUE; WAS A FACTOR. COPLT CLRED FOR VISUAL APCH TO RWY 35L; COS; WITH RWY 35L ILS BRIEFED AND SET UP AS A BACKUP. NORMAL R HAND PATTERN AND APCH FLOWN INTO 20 KT HEADWIND. STABLE 3 DEG FLAP APCH THROUGHOUT WITH AIRSPD PLUS OR MINUS 3 KTS FLUCTUATION MAX. VISUAL ILLUSION OF BEING HIGH DURING APCH TO RWY 35L DISCUSSED DURING APCH BRIEFING; SO SPECIAL EMPHASIS WAS PLACED ON STAYING ON GS AND ON PAPI. FIRST INDICATION OF HIGHER THAN NORMAL SINK RATE NOTICED AT APPROX 50 FT. COPLT AT THIS POINT HAD NOT RETARDED PWR AND AS I WAS PLACING MY R HAND ON THROTTLES TO MAKE SURE THE PWR STAYED UP; HE ROTATED TO CATCH THE SINK; COMPOUNDING THE HARD LNDG. ACFT BOUNCED AND THE L MAIN GEAR UNSAFE LIGHT ILLUMINATED. I ADVANCED THE THROTTLES AND INITIATED THE GAR WITH COPLT STILL FLYING - - ACFT DID NOT RECONTACT THE RWY. GEAR AND FLAPS RETRACTED IAW SOP'S (30 DEGS FLAP TO 15 DEGS FLAP) AND CLRNC RECEIVED TO FLY 8000 FT TFC PATTERN WHILE PROB LOOKED INTO. COPLT CONTINUED FLYING AND TALKING TO ATC. I WORKED WITH SO AND ACCOMPLISHED THE 'LNDG GEAR UNSAFE INDICATION -- GEAR LEVER DOWN' IRREGULAR PROC. AFTER BEING ASSURED THE L MAIN GEAR WAS INDEED DOWN AND LOCKED; AN UNEVENTFUL LNDG WAS ACCOMPLISHED. SUPPLEMENTAL INFO FROM ACN 247248: ROLLING HILLS AND THE WINDS REQUIRED NUMEROUS PWR CHANGES IN ORDER TO REMAIN ON PROFILE. A ROTATION WAS INITIATED TO SLOW THE SINK RATE AND THE ACFT DID NOT SEEM TO RESPOND NORMALLY SO A MORE AGGRESSIVE ROTATION WAS MADE. SUPPLEMENTAL INFO FROM ACN 247435: CAPT AND SO ACCOMPLISHED THE PROC FOR UNSAFE GEAR INDICATION. GEAR WAS CHKED SAFE USING THE CABIN VIEW PORTS. PAX AND FLT ATTENDANTS WERE BRIEFED. NORMAL LNDG ACCOMPLISHED WITH NO FURTHER INCIDENTS OR PROBS. CONTRIBUTING FACTOR IS THAT THE RWY 35L APCH END SLOPES DOWNWARD FOLLOWED BY A STEADY UPSLOPING OF RWY.