PLT TAXIED OVER TXWY LIGHT AND PROP STRUCK THE LIGHT.

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TAXIING TO WARM/RUNUP AREA; NIGHT; CLR; DRY; VISIBILITY UNLIMITED. TXWY LIGHTS WERE ON. AFTER HOLDING FOR OPPOSITE DIRECTION TFC; PROCEEDED W TOWARDS RUNUP AREA. A BONANZA WAS IN THE RUNUP SO I KEPT THE LNDG LIGHT OFF. I OBSERVED 2 TAXI LIGHTS ON MY L (APPROX 8-12 INCHES OFF TXWY SURFACE (HIGH)). I SLOWLY PROCEEDED STRAIGHT AHEAD AND FELT A SHARP KICK IN THE NOSE GEAR STEERING. FEARING WE HAD HIT A TAXI LIGHT WE STOPPED AND SHUT THE ENG DOWN. INSPECTION REVEALED DAMAGE TO BOTH PROP TIPS. WE RETURNED THE ACFT TO THE LINE. WHILE I AM NOT POSITIVE; I DON'T BELIEVE THAT THE TAXI LIGHT WAS OPERATIONAL. HIGH PRIORITY SHOULD BE PLACED ON FLUSH MOUNTED TAXI AND RWY LIGHT FIXTURES. THERE WAS NO INDICATION OF THE PROP STRIKE WITHOUT SHUTTING DOWN THE ENG AND VISUALLY INSPECTING THE ACFT. OF NOTE: THE HAWTHORNE RUNUP AREA IS ABOUT 1000 FT FROM THE DEP END OF RWY 25; REQUIRING A BACK-TAXI AGAINST THE FLOW OF TFC. THE BONANZA IN THE RUNUP AREA WAS THEREFORE NOSE-TO-NOSE PREVENTING USE OF THE LNDG LIGHT.