1.  Luminous intensity detection refers to the intensity of light, which refers to the amount of light emitted within a specific angle. Due to the concentration of LED light, the inverse square law is not applicable at close range. The CIE127 standard specifies two conditions for measuring the average normal light intensity: measurement condition A (far field condition) and measurement condition B (near field condition), both of which have a detector surface area of 1cm2. Normally, standard condition B is used to measure the luminous intensity. 2.  Luminous flux and luminous efficiency detection Luminous flux is the sum of the amount of light emitted by the light source, which is the amount of light emitted. The detection methods mainly include the following two types: (1) integration method. Ignite the standard lamp and the tested lamp in sequence within the integrating sphere, and record their readings on the photoelectric converter as Es and ED, respectively. The standard light flux is known Φ s. The luminous flux of the tested lamp Φ D=ED ×Φ S/Es. The integration method utilizes the principle of "point light source" and is easy to operate, but is affected by the color temperature deviation between the standard lamp and the measured lamp, resulting in significant measurement errors. (2) Spectroscopy. By spectral energy P（ λ） Calculate the distribution to obtain the luminous flux. Using a monochromator, measure the 380nm to 780nm spectra of the standard lamp within the integrating sphere, and then measure the spectra of the tested lamp under the same conditions, comparing and calculating the luminous flux of the tested lamp. 3.  The spectral characteristic detection of LED includes spectral power distribution, color coordinates, color temperature, color rendering index, and other contents. The spectral power distribution indicates that the light of a light source is composed of many different wavelengths of color radiation, and the radiation power of each wavelength is also different. This difference is called the spectral power distribution of the light source when arranged in order with the wavelength. Compare and measure the light source using a spectrophotometer (monochromator) and a standard lamp. The color coordinate is a numerical representation of the amount of luminous color of a light source on a coordinate map. There are multiple coordinate systems for representing colors, usually using X and Y coordinate systems. Color temperature refers to the amount of light source color table (appearance color representation) visible to the human eye. When the light emitted by a light source has the same color as the light emitted by an absolute blackbody at a certain temperature, that temperature is the color temperature. In the field of lighting, color temperature is an important parameter that describes the optical characteristics of light sources. The relevant theory of color temperature originates from blackbody radiation, which can be obtained from the color coordinates containing blackbody trajectories through the color coordinates of the light source&Nbsp