Luminous Efficacy Tables
The light sensitivity of the normal human eye has been studied extensively. The response of the eye as a function of frequency is called the luminous efficacy of the eye. It has been tabulated for both the light-adapted (photopic) case and the dark-adapted (scotopic) case. |  |
Wavelength
λ (nm) |
Photopic Luminous Efficacy
Vλ | Photopic Conversion
lm/W | Scotopic
Luminous Efficacy
V'λ | Scotopic Conversion
lm/W |
| 380 | 0.000039 | 0.027 | 0.000589 | 1.001 |
| 390 | 0.000120 | 0.082 | 0.002209 | 3.755 |
| 390 | 0.000120 | 0.082 | 0.002209 | 3.755 |
| 400 | 0.000396 | 0.270 | 0.009290 | 15.793 |
| 410 | 0.001210 | 0.826 | 0.034840 | 59.228 |
| 420 | 0.004000 | 2.732 | 0.096600 | 164.220 |
| 430 | 0.011600 | 7.923 | 0.199800 | 339.660 |
| 440 | 0.023000 | 15.709 | 0.328100 | 557.770 |
| 450 | 0.038000 | 25.954 | 0.455000 | 773.500 |
| 460 | 0.060000 | 40.980 | 0.567000 | 963.900 |
| 470 | 0.090980 | 62.139 | 0.676000 | 1149.200 |
| 480 | 0.139020 | 94.951 | 0.793000 | 1348.100 |
| 490 | 0.208020 | 142.078 | 0.904000 | 1536.800 |
| 500 | 0.323000 | 220.609 | 0.982000 | 1669.400 |
| 507 | 0.444310 | 303.464 | 1.000000 | 1700.000 |
| 510 | 0.503000 | 343.549 | 0.997000 | 1694.900 |
| 520 | 0.710000 | 484.930 | 0.935000 | 1589.500 |
| 530 | 0.862000 | 588.746 | 0.811000 | 1378.700 |
| 540 | 0.954000 | 651.582 | 0.655000 | 1105.000 |
| 550 | 0.994950 | 679.551 | 0.481000 | 817.700 |
| 555 | 1.000000 | 683.000 | 0.402000 | 683.000 |
| 560 | 0.995000 | 679.585 | 0.328800 | 558.960 |
| 570 | 0.952000 | 650.216 | 0.207600 | 352.920 |
| 580 | 0.870000 | 594.210 | 0.121200 | 206.040 |
| 590 | 0.757000 | 517.031 | 0.065500 | 111.350 |
| 600 | 0.631000 | 430.973 | 0.033150 | 56.355 |
| 610 | 0.503000 | 343.549 | 0.015930 | 27.081 |
| 620 | 0.381000 | 260.223 | 0.007370 | 12.529 |
| 630 | 0.265000 | 180.995 | 0.003335 | 5.670 |
| 640 | 0.175000 | 119.525 | 0.001497 | 2.545 |
| 650 | 0.107000 | 73.081 | 0.000677 | 1.151 |
| 660 | 0.061000 | 41.663 | 0.000313 | 0.532 |
| 670 | 0.032000 | 21.856 | 0.000148 | 0.252 |
| 680 | 0.017000 | 11.611 | 0.000072 | 0.122 |
| 690 | 0.008210 | 5.607 | 0.000035 | 0.060 |
| 700 | 0.004102 | 2.802 | 0.000018 | 0.030 |
| 710 | 0.002091 | 1.428 | 0.000009 | 0.016 |
| 720 | 0.001047 | 0.715 | 0.000005 | 0.008 |
| 730 | 0.000520 | 0.355 | 0.000003 | 0.004 |
| 740 | 0.000249 | 0.170 | 0.000001 | 0.002 |
| 750 | 0.000120 | 0.082 | 0.000001 | 0.001 |
| 760 | 0.000060 | 0.041 | 0.000000 | 0.000 |
| 770 | 0.000030 | 0.020 | 0.000000 | 0.000 |
Source: Table 6-1 of Williamson & Cummins, Light and Color in Nature and Art, Wiley, 1983. The Photopic conversion (lm/W) is obtained by multiplying Vλ by 683 and the Scotopic conversion is obtained by multiplying V'λ by 1700 as suggested by those authors.
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Index
Photometry concepts
Vision concepts |