The FDLL system operates with one CDRH/FDA Safety Approved 200-watt yag green laser mounted in a control room in the stadium, (automatically adjusted wattage and power based on the ambient light sensed in the stadium, high sun higher wattage, lower light less power) connected via thin fiber optic strong coaxial cable, to one or more laser projectors mounted from directly overhead and angled directly down safely onto the playing field.

 

Controlled by the referees on the field and in the booth, by a ring on their finger, when the ring is pressed the line appears on that exact spot 53.3 yards across the field. Instant on, and instant off - by a simple press of a button on the referee’s ring.

 

As the official first down markers are moved up and down the field, and or the officials mark the first down, so moves the overhead projectors via computer algorithm, to directly overhead to project our first down laser line down onto the field.