／var／logmarcus chiu

Candela (cd)

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Candela (cd)
  • the unit of luminous intensity in the International System of Units (SI)
  • is defined by taking the fixed numerical value of the luminous efficacy of monochromatic radiation of frequency 540Γ—1012𝐻𝑧, 𝐾𝑐𝑑, to be 683 when expressed in the unit lm π‘Šβˆ’1, which is equal to π‘π‘‘Β·π‘ π‘ŸΒ·π‘Šβˆ’1, or π‘π‘‘Β·π‘ π‘ŸΒ·π‘˜π‘”βˆ’1Β·π‘šβˆ’2·𝑠3, where the kilogram, meter, and second are defined in terms of β„Ž, 𝑐, and Δ𝑣𝐢π‘