LED products are very sensitive to temperature; The LED product beam is generally narrow, and usually adopts the integrated design of light source and lamps. The traditional relative measurement is no longer applicable, while the measurement of absolute luminous flux and light intensity distribution requires higher methods and equipment. There is obvious space color inhomogeneity in LED products.
Due to the special luminescence performance of LED products, the accurate measurement of their total luminous flux is very challenging, and the horizontal comparability of LED products in light efficiency measurement is not ideal. The measurement of total luminous flux of LED products has become a key concern in the research and development of relevant standards in various countries.

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