1000 square meters restaurants are equipped with 10 fly-killing lights. The average coverage area of the fly-killing lamp is 100 square meter. Due to the layout of the restaurant and the complex indoor environment, the actual installation can not be completely calculated according to the theoretical coverage area. The correct arrangement is to install the restaurant fly-killing lamp in the necessary place on the big wall and calculate the area it can cover. The radiation areas of the restaurant fly-killing lights will overlap, as long as the distance between the two lights is not too close.