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Appendix B: Photometry and Radiometry Reference
J17 Instruction Manual
B-5
CIE Photopic Curve
The CIE photopic curve is an international standard for
the color response of the average human eye. By
definition, footcandles, footlamberts, lux, and nits are
based on a detctor having a color response identical to
the CIE photopic curve. Tektronix photopic sensors
have response curves that match the CIE photopic
curve. Refer to Figure BĆ1.
380 420 460 500 540 580 620 680 700
100
80
60
40
20
0
Relative Spectral Response (%)
(nm)
Figure BĆ1:ăCIE Photopic Curve
Appendix B: Photometry and Radiometry Reference
J17 Instruction Manual
B-5
CIE Photopic Curve
The CIE photopic curve is an international standard for
the color response of the average human eye. By
definition, footcandles, footlamberts, lux, and nits are
based on a detctor having a color response identical to
the CIE photopic curve. Tektronix photopic sensors
have response curves that match the CIE photopic
curve. Refer to Figure BĆ1.
380 420 460 500 540 580 620 680 700
100
80
60
40
20
0
Relative Spectral Response (%)
(nm)
Figure BĆ1:ăCIE Photopic Curve