Luminous Efficacy Table

Luminous efficacy is used to measure how well a light source produces light. It is the ratio of the luminous flux to power. If power is replaced by the radiant flux, then it is the luminous efficacy of the radiation. Here is a table with the luminous efficacy for wavelengths in photopic and scotopic vision.

Wavelength
λ (nm)
Photopic Luminous EfficacyVλPhotopic Conversion lm/WScotopic Luminous Efficacy V'λScotopic Conversion lm/W
3800.0000390.0270.0005891.001
3900.0001200.0820.0022093.755
3900.0001200.0820.0022093.755
4000.0003960.2700.00929015.793
4100.0012100.8260.03484059.228
4200.0040002.7320.096600164.220
4300.0116007.9230.199800339.660
4400.02300015.7090.328100557.770
4500.03800025.9540.455000773.500
4600.06000040.9800.567000963.900
4700.09098062.1390.6760001149.200
4800.13902094.9510.7930001348.100
4900.208020142.0780.9040001536.800
5000.323000220.6090.9820001669.400
5070.444310303.4641.0000001700.000
5100.503000343.5490.9970001694.900
5200.710000484.9300.9350001589.500
5300.862000588.7460.8110001378.700
5400.954000651.5820.6550001105.000
5500.994950679.5510.481000817.700
5551.000000683.0000.402000683.000
5600.995000679.5850.328800558.960
5700.952000650.2160.207600352.920
5800.870000594.2100.121200206.040
5900.757000517.0310.065500111.350
6000.631000430.9730.03315056.355
6100.503000343.5490.01593027.081
6200.381000260.2230.00737012.529
6300.265000180.9950.0033355.670
6400.175000119.5250.0014972.545
6500.10700073.0810.0006771.151
6600.06100041.6630.0003130.532
6700.03200021.8560.0001480.252
6800.01700011.6110.0000720.122
6900.0082105.6070.0000350.060
7000.0041022.8020.0000180.030
7100.0020911.4280.0000090.016
7200.0010470.7150.0000050.008
7300.0005200.3550.0000030.004
7400.0002490.1700.0000010.002
7500.0001200.0820.0000010.001
7600.0000600.0410.0000000.000
7700.0000300.0200.0000000.000

Eye responses are represented by luminosity function. Eye responses under bright condition is called as photopic vision and responses under lighter conditions are called as scotopic vision. The above table is based on the wavelengths of these vision.

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