Dragnet - The Big Light (1953) crime drama TV series
Dragnet —later syndicated as Badge 714 — was an American television series, based on the radio series of the same name, both created by their star, Jack Webb. Both shows take their name from the police term "dragnet", meaning a system of coordinated measures for apprehending criminals or suspects.

The show enacts the cases of a dedicated Los Angeles police detective, Sergeant Joe Friday, reprise by Webb; also starring was Ben Alexander as his partner, Officer Frank Smith. (source - wikipedia)

Plot - Henry Wilson, a Hollywood movie director, has been killed by a falling arc light. Was it really an accident? To answer this question, Friday and Smith go Hollywood with a wonderful excuse to visit the studios. But the two men do not fail to mix business with pleasure and they will wind up solving the mystery. (IMDB)

Director: Jack Webb
Writers: Jack Webb (creator), John Robinson
Stars: Jack Webb, Ben Alexander, Herb Vigran
Production Co: Mark VII Ltd.