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American Society for Testing and Materials (ASTM), ??? ???? ??

PH-BPS, ??? ???? ??

Group Standards of the People's Republic of China, ??? ???? ??

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, ??? ???? ??

International Commission on Illumination (CIE), ??? ???? ??

Ente Nazionale Italiano di Unificazione, ??? ???? ??

RO-ASRO, ??? ???? ??

Kingdom of Bahrain Testing and Metrology Directorate, ??? ???? ??

Spanish Association for Standardization (UNE), ??? ???? ??

International Organization for Standardization (ISO), ??? ???? ??

The Directorate General of Specifications and Metrology (DGSM) , ??? ???? ??

Danish Standards Foundation, ??? ???? ??

CEN - European Committee for Standardization, ??? ???? ??

British Standards Institution (BSI), ??? ???? ??

German Institute for Standardization, ??? ???? ??

GOST, ??? ???? ??





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