AN ACR MLG MISTOOK TXWY EDGE LIGHTS (BLUE) FOR TXWY CTRLINE LIGHTS (GREEN) AND TAXIED INTO THE WEEDS.

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ON LNDG ROLL ENCOUNTERED VERY LOW VISIBILITY FOG BANK LAST 1/3 OF RWY 23R AT TYS. I DISCUSSED LOWER THAN RPTED VISIBILITY TO TYS TWR AS ARPT WAS RPTING 3 MI AND ANOTHER ACFT WAS COMMENCING APCH TO 23R. I ROLLED ALL THE WAY TO THE END OF 23R AND WAS SLOW; TO VERY SLOW; TAXI SPD DUE TO ALMOST 0/0 VISIBILITY. I COULD SEE THE B1 TXWY THROAT AND APPARENTLY THE TXWY EDGE LIGHTS WITH THE REFLECTION OF THE TAXI LIGHT AND FOG APPEARED GREEN RATHER THAN BLUE. I WENT FOR THE LIGHTS OUT OF THE HABIT OF FOLLOWING GREEN TXWY CTRLINE LIGHTS AND RAN THE NOSEWHEEL AND L MAIN GEAR THROUGH THE GRASS ON THE EDGE OF THE TXWY THROAT. FORTUNATELY; THE GND WAS DRY AND FIRM AND THE ACFT ROLLED ACROSS THE GRASS AND BACK ONTO THE HARD SURFACE WITHOUT GETTING STUCK. I CALLED THE TWR AND REQUESTED THAT THEY CHK TO SEE IF I HAD RUN OVER ANY TXWY LIGHTS ALTHOUGH I DIDN'T FEEL THE ACFT STRIKE ANY. UPON ARR AT THE GATE; I MADE A LOGBOOK ENTRY AND HAD MAINT CHK THE GEAR. NO DAMAGE WAS FOUND. I FEEL THIS PHENOMENON OF BLUE LIGHTS APPEARING GREEN SHOULD BE CHKED AND PLTS SHOULD BE CAUTIONED ABOUT THIS POSSIBILITY IN VERY LOW VISIBILITY SITS.