Difference between LED and traditional light source

High pressure sodium lamp has been used in agricultural production for a long time, and LED has just begun to be used. But as a general lighting, at present, LED market share is higher and higher, many traditional lamps are replaced by LED, which is the inevitable trend of scientific and technological development. However, the spectral output of metal halide lamp is relatively fixed, and it is difficult to control the spectral change, so it is suitable for the growth of certain plants. At present, metal halide lamp is widely used in tomato planting, but if it is a plant factory, LED is much better than it, and its spectrum is more suitable.