Cast light lamps, which specifies the illuminance on the illuminated surface is higher than that of the ambient lighting. Also called the spotlight. Usually, it is able to aim at any direction, and have not affected by climatic conditions affecting the structure. Mainly for large field operations mine, building outline, stadium, overpass, monuments, parks and parterre. Therefore, almost all of the outdoor use of large area lighting can be thought of as cast light lamps. Light emitting angle of a beam with a narrow width, changes in the range of 0 to 180 DEG between beam, which particularly narrow called searchlight.