In this article appears a prventive raffic light implementation of two faces with leds of high luinescence of yellow color that has adapted in its interior a source switched in Step-down (reductor), with a control system that makes that the traffic light works with a determinated amunt of sparkles per minute, wich they are alternated for the two faces.Step-down (reductor), with a control system, that makes that the traffic light works with a determinated amount of sparkles per minute, wich they are alternated for the two faces. This traffic lights offers us more luminosity and less consume of energy; we obtainso the incursion in the area of the optoelectronics in order to make new applications in the productive sector.