The SL-9272 High Pressure Sodium Security light delivers the maximum amount of coverage you could ask for. Delivering a whopping 30,800 square-Feet of light coverage, light will shine the largest of areas. Heath/Zenith"s Journeyman series are some of the toughest lights on the market today and ready for any thing mother nature can throw at it. This light also has Heath/Zenith"s exclusive Dusk-to-Dawn technology which packs intelligence to tell the light to only come on when it is dark enough outside that light is needed. The next morning, the same intelligence tells the light to turn off.