A B727 CARGO FLT PERFORMS A TKOF AT BELOW AUTH RVR WITH CTRLINE LIGHTS INOP FOR RWY 35 AT COS; CO.

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ENRTE TO COS. PRIOR TO DEP; WX INDICATED 1 MI SNOW SHOWERS AND MIST. UPON ARR; THE WX WAS AS FORECAST. DURING THE LOADING/UNLOADING OF FREIGHT AT INTERMEDIATE STOP; THE WX DETERIORATED SIGNIFICANTLY. THE SNOW STOPPED AND ICE/FOG ROLLED IN WITH THE VISIBILITY GOING UP AND DOWN; VARYING VISIBILITY OF 1000-1600 FT RVR. PRIOR TO PUSHBACK; WE DEICED AND CHKED TWR WX: RWY 35L; 1600 FT RVR; RWY 35R; 3000 FT RVR. CHKING OUR OPS SPECS; A DEP ON RWY 35L AT 1600 FT RVR IS LEGAL. DURING TAXI OUT; WX CHANGED TO 1200 FT RVR THEN TO 1400 FT RVR. WE STOPPED AND RECHKED DEP REQUIREMENTS. THEY INDICATED RWY 35L WITHOUT CTRLINE LIGHTS NEEDED 1600 FT RVR; RWY 35R WITH CTRLINE LIGHTS NEEDED 1000 FT RVR. I LOOKED AT THE BLOCK FOR RWY 35R; SAW 1000 FT RVR AND CTRLINE LIGHTS REQUIRED AND SAID 'WE ARE OK FOR RWY 35R' (REALISTICALLY DEPARTING RWY 35L.) THE FO AGREED. I WAS THE PF; FO HAD LESS THAN 100 HRS IN TYPE ACFT. I MADE THE ERROR IN SEEING WHAT I WANTED TO SEE BEING TIRED. THE FO WAS NEW; FLEW THE ACFT WELL BUT IN HINDSIGHT; WAS UNSURE OF OPS SPECS AND NOT HELPFUL WHEN I MADE THE MISTAKE OF QUOTING THE FIGURES/NUMBERS FOR RWY 35R. WE BEGAN THE ENG RUNUP FOR ICING THEN BEGAN TKOF ROLL. AT 100 KTS; V1 106/VR 124; I REALIZED THERE WAS NO CTRLINE LIGHTS. THE FORWARD VISIBILITY WAS GOOD; WITH ALL RWY MARKINGS VISIBLE. AN ABORT AT THIS POINT WOULD HAVE BEEN A SECOND POOR DECISION. THE TKOF ROLL AND TKOF WERE NORMAL. AFTER LEVELOFF; I BRIEFED THE CREW ON WHAT I THOUGHT HAD OCCURRED. THEY BOTH AGREED AFTER REREADING THE OPS SPECS SEVERAL TIMES. INCIDENT DUE TO FATIGUE; BEING TIRED AND SEEING WHAT I NEEDED AND WANTED TO SEE FOR TKOF. LOOKED AT FIGURES FOR RWY 35R; NOT RWY 35L. FATIGUE; INATTN TO DETAIL; MY ERROR.