INFLT FIRE. FIRE EXTINGUISHED. FLC DISTR SMOKE IN COCKPIT.

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LOG BOOK WRITE-UP SHOWED CAPT'S FLT DIRECTOR PMS LIGHT WOULD NOT STAY IN. I REMOVED THE LIGHT FROM THE SOCKET TO EXAMINE THE BACK. WHEN I REMOVED THE LIGHT; SPARKS; FLAME (SMALL) AND A LARGE STREAM OF VERY DENSE SMOKE ERUPTED. THE SMOKE WENT DIRECTLY INTO MY FACE CAUSING IMMEDIATE BURNING IN MY NOSTRILS AND THROAT. CALLED FOR OXYGEN MASKS 100 PERCENT! (THOUGHT ABOUT FLAME AND OXYGEN LATER). FO TURNED OFF PMS. I CALLED FOR HALON BOTTLE. I POINTED; BUT DIDN'T FIRE IT SINCE FO TURNING OFF PMS REMOVED THE PWR SOURCE. FLAME STOPPED AND SOCKET WENT FROM BRIGHT RED TO NO COLOR IN LESS THAN 1 MINUTE. SMOKE CONTINUED; BUT DECREASED TO NOTHING IN 3-4 MINUTES. WE REMAINED ON OXYGEN UNTIL COCKPIT CLRED OF SMOKE. LEAD FLT ATTENDANT RPTED SWELLING SMOKE AT DOOR 2. A SPRING FROM THE LARGE PIN ON THE BACK OF THE LIGHT FELL OFF AND SHORTED AGAINST OTHER PINS. SPRING BECAME WELDED IN PLACE. AIR FLOW BEHIND PANEL DIRECTED SMOKE DIRECTLY INTO MY FACE; BUT STOPPED BEING SEVERE WITHIN SECONDS DUE TO FO QUICK ACTION IN TURNING OFF PMS. BEFORE WE DONNED SMOKE GOGGLES; THE PROB SUBSIDED. I CREDIT MY COPLT AND HIS IMMEDIATE REACTION FOR THE ALMOST INSTANT RESOLUTION TO THE PROB.