Total solar radiation:Generally refers to the total energy of light reaching a certain point, expressed in units of energy, such asW/m²

Photosynthetically active radiation:It refers to the energy of the portion of total solar radiation or artificial light sources that can be used for photosynthesis (generally referring to visible light), measured400-700nmThe luminous flux density of light is commonly measured in micrometers in physiologymol m^-2s^-1

UV intensity:Generally refers to solar radiation or artificial light sources280-400nmThe energy of light. The commonly used unit in physiology is μmol m^-2s^-1Ultraviolet radiationARefers to ultraviolet light that is closer to visible light320-400nmLight, ultraviolet radiationBRefers to shorter wavelengths in ultraviolet light280-320nmThe light.

Light intensity measuring instrument type:

3415FType:

determine400-700nmPhotosynthetically active radiation（PAR）Measurement range:0-2000μmol m^-2s^-1

3415FXSEType:

determine400-700nmPhotosynthetically active radiation（PAR）Measurement range:0-2000μmol m^-2s^-1

3134FType:

determine250-400nmWavelength of ultraviolet radiation, measurement range:0-200.0μmol m^-2s^-1(For example: studying the filtration of ultraviolet rays by glass or film in greenhouses)

3412Type:

Measure the ratio of red light to far red light and the ratio of far red light to analyze the degree of plant density.

Origin and manufacturer: United StatesSpectrum