CTLR HAD LESS THAN STANDARD SEPARATION BETWEEN TAXIING ACFT ON RWY AND DEPARTING MLG.

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SMT X LANDED ON RWY 30R. AS HE SLOWED TO TAXI SPD I INSTRUCTED HIM TO TURN RIGHT ONTO TXWY ROMEO; WHICH IS LOCATED SOME 2500' FROM THE APCH END OF THE RWY. HE REPLIED 'ROGER.' MLG Y WAS TAXIED INTO POS AND HOLD ON 30R. I OBSERVED SMT X LNDG LIGHTS TURN TO THE RIGHT AN THEN TO LEFT AS HE TAXIED; INDICATING TO ME HE HAD MADE A LEFT TURN ONTO THE PARALLEL TXWY FOXTROT THAT IS SEPARATED CENTERLINE TO CENTERLINE BY 500'. SMT X MADE NO OTHER XMISSION TO ME INDICATING THAT HE HAD MISSED THE ROMEO TXWY; WHICH INDEED IS WHAT HAPPENED. SMT X CONTINUED DOWN TO THE NEXT TXWY NOVEMBER; LOCATED SOME 2000' DOWNFIELD FROM ROMEO. ON TXWY FOXTROT IN BTWN 'R' AND 'N' TO THE N LIES THE FBO. ON TOP OF THE 3 HANGARS LIES 11 HIGH INTENSITY LIGHTS WHICH CAST A DIFFICULT GLARE ONTO THEIR RAMP AS WELL AS TXWY F AND A SMALL PORTION OF 30R; AT TIMES MAKING VIS DIFFICULT. WITH SMT X TAXIING ON THE RWY IN BTWN 'R' AND 'N'; MLG Y WAS CLRD FOR TKOF. SMT X CLRD THE RWY AS MLG Y ROLLED BTWN 'R' AND 'S' SOME 2000-3000' AWAY.