Colpi di luce (internationally released as Light Blast) is a 1985 Italian science-fiction action film directed by Enzo G. Castellari.

Then doctor Yuri Svoboda, former University of San Francisco professor, menace the municipality of the town with his laser ray if he is not given five million dollars.

The authorities did not give up and investigations are handled by Ron, a skilled inspector with a reputation for hard (like the 'Dirty Harry' cop interpreted to asbestos years ago by Clint Eastwood).

All in all, the film has merit, is to be attributed to the unconscious provincialism Castellari that focuses the true protagonist of the story: San Francisco, photographed documentary with wisdom, in its new and its old.

To face it is, in the role of Lt. Ronnie Warren, that Erik Estrada known to television audiences for a successful series, that of 'Chips' intrepid policemen of California Street.