Plant growth LED should not only consider its basic luminosity and irradiance performance,  but also consider the photosynthetic characteristics of plants. In the light photon system and the plant photometry system,  the photon density of the illuminated surface of plants and plant photometry parameters are considered，important parameters for plant photometry research include photosynthetically active radiation PAR,  photosynthetic photon flux density PPFD, effective photon flux density YPFD, chlorophyll-weighted irradiance E-ch A and E-ch B, photosynthetic irradiance E-p,  and photosynthetically red blue irradiance ratio Erb-p.

      The CL800 series spectrophotometer adopts high-precision concave grating splitting，0.2nm wavelength accuracy, ， 1nm wavelength interval output. It can accurately measure the irradiance spectrum in the range of 320-800nm at the highest, and can perfectly test the above plant photometry parameters. 

      The instrument is equipped with 2.8-inch capacitive touch screen, Bluetooth /TypeC/ reserved WIFI interface, large-capacity memory and 4000mAh lithium battery. It is portable and has ultra long standby time, which is very suitable for outdoor plant growth lamp testing. Its main test interface is shown in the figure.