LTT STRUCK TXWY LIGHT DURING TAXI RESULTING IN DAMAGE TO A PROP.

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I WAS THE PF. THERE WERE NO PAX. WE TURNED OFF RWY 1 TO TXWY C AND PROCEEDED TO THE RAMP AREA. THIS INVOLVED A TURN OF APPROX 70 DEGS ONTO TXWY A. IT WAS AT THIS POINT THE ACFT LEFT THE TXWY AND THE R PROP STRUCK A TXWY LIGHT (IT WAS A R TURN). HOW I LEFT THE TXWY REMAINS A MYSTERY TO ME. THE TXWY WAS BARE AND DRY; THE CTRLINE CLRLY VISIBLE. I HAVE NEGOTIATED THIS SAME TURN; LITERALLY HUNDREDS OF TIMES IN THE PAST; SOME IN NIGHTS; SNOW; AND ICE CONDITIONS. ALTHOUGH THERE WAS SNOW ACCUMULATED A FEW INCHES AT THE TXWY EDGES I DO NOT BELIEVE THIS TO BE A FACTOR. WHEN WE HIT THE LIGHT WE BOTH LOOKED AT EACH OTHER AND SAID; 'WHAT WAS THAT?' I REALLY THOUGHT WE HAD JUST RAN OVER AN ICE RUT OR SMALL BERM AT THE TXWY EDGE; AND WAS QUITE SURPRISED TO LEARN I HAD TAKEN OUT A TXWY LIGHT (MY FIRST). AS PER OUR CHKLIST; AFTER WE CLRED THE RWY; I CALLED '(PROPS TO) TAXI;' WHICH IS THE SIGNAL TO EACH CREW MEMBER TO START HIS 'FLOW.' MINE WAS SHUTTING OFF THE AUTOFEATHER; AUTOIGNITER; AND ANTI-ICE SWITCHES; THE FO'S WAS RETARDING THE PROP CTL LEVERS TO THEIR TAXI DETENT; RETRACTING FLAPS; AND SETTING THE XPONDER TO STANDBY. I CAN ONLY ASSUME THAT I WAS ENVELOPED IN A MOMENT'S INATTN; JUST LONG ENOUGH TO CUT THE CORNER TO GET THE INTXN. IT HAPPENED JUST THAT QUICK. I REALLY CAN'T RECALL BEING OFF THE TXWY AS WE MADE THE TURN. MY ATTN WAS DIVERTED INSIDE THE COCKPIT. I DID NOT PAY ATTN TO THE TURN.