Anh
primary luminous standard
primary standard of light
Đức
Lichteinheit
Primärnormal
Pháp
étalon primaire de lumière
primary luminous standard,primary standard of light /ENG-ELECTRICAL/
[DE] Lichteinheit; Primärnormal
[EN] primary luminous standard; primary standard of light
[FR] étalon primaire de lumière