Integrating sphere is a hollow sphere whose inner wall is coated with white diffuse reflective material, also known as photometric sphere, luminous fl

The main test of ies lm-79 is photoelectric performance test. Because some test items need to be completed with the help of distributed photometer, or

Ies test is completed with the help of distributed photometer. The measured formats mainly include North American ies, European LDT, international CIE

MTBF, mean time between failures, is the full English name of mean time between failure. It is an index to measure the reliability of a product (espec