Light is specified on the illuminated surface is higher than ambient light illumination. Also called spotlight. Usually, it can aim in any direction and have structures that are not affected by climatic conditions. Mainly used in large areas, mines, buildings, contours, stadiums, overpasses, monuments, parks and flower beds, etc.. As a result, almost all outdoor lighting fixtures are considered light emitting lamps. The angle of the outgoing beam of the light projector is wide and narrow, and the range of variation is between 0 and ~180 degrees. The beam is especially narrow, and is called searchlight.