AN MLG ACR CREW HIT A TAXI LIGHT WHILE TRYING TO MAKE VERY TIGHT TURN. TXWY EXCURSION.

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AFTER LNDG 10L PIT WE EXITED RWY AT N4. (HIGH SPD TURN). GND CTL ASKED IF WE COULD MAKE A HARD R TURN TO TAXI W ON TXWY N. ABOUT 1/2 WAY INTO THE TURN; FO AND I REALIZED IT WAS GOING TO BE TOO TIGHT. WE THEN MADE A HARD L TURN BACK TO FACE E ON TXWY N. WHILE MAKING THE L TURN; THE NOSEWHEEL LOCKED IN A NEAR 90 DEG L TURN. THE ACFT HAD TO BE TOWED TO THE RAMP. IN RETROSPECT; THE REASON FOR THE NOSEWHEEL BEING LOCKED IN THAT POS WAS CONTACT OF A TXWY LIGHT. FURTHER CHKS INDICATED NO ACFT DAMAGE. A TXWY LIGHT WAS DAMAGED. BETTER MARKINGS LIKE FLUORESCENT PAINT WOULD HAVE HELPED TO PREVENT THIS SIT WITH THIS SIZE ACFT. I HAVE ALWAYS BEEN CONCERNED OF THE REAR WHEELS IN TURNS. I OVERCOMPENSATED IN THIS CASE. SUPPLEMENTAL INFO FROM ACN 231913: AS CAPT STARTED TO CTR TILLER TO STRAIGHTEN OUT THE AIRPLANE; HE FOUND THAT THE WHEEL WOULDN'T GO BACK TO CTR. GEAR WAS STUCK AT 90 DEGS L. INSPECTION OF THE NOSEWHEEL SHOWED NO DAMAGE -- IT HAD MERELY GONE OVER CTR AND GOT STUCK THERE. ACFT WAS INSPECTED AND TAXI CHKED. ON FOLLOWING FLT TAXIING OUT; WE BOTH NOTED THAT PRACTICALLY ALL THE YELLOW LINES WERE NEARLY INVISIBLE.