Case analysis of lamp efficiency

Take an LED street lamp with light source power of 100w as an example: the initial luminous flux is 1 1200lm. Because the LED emits light in one direction, the efficiency of the lamp is high, with lens loss of 10% and lamp loss of 10%. The luminous flux of lamps and lanterns is 9070lm, and the total power of lamps and lanterns is 1 10w, so. The ratio of the total luminous flux emitted by the lamp to the total luminous flux emitted by all light sources in the lamp under the same use conditions.