However, the overall luminosity function ( which in fact is a weighted sum of these three curves ) is subjective, since it involves asking a test person whether two light sources have the same brightness, even if they are in completely different colors.
42.
Based on the method of comparing the luminosities of globular clusters ( located in galactic halos ) from distant galaxies to that of the Virgo cluster, the globular cluster luminosity function carries an uncertainty of distance of about 20 % ( or 0.4 magnitudes ).
43.
Here's the abstract from a recent ApJ article : " We study the luminosity functions of high-redshift galaxies in detailed hydrodynamic simulations of cosmic reionization, which are designed to reproduce the evolution of the Ly? forest between z ~ 5 and ~ 6.
44.
For example, the luminous efficacy of a typical YAG yellow phosphor based white LED ranges from 3 to 5 times the luminous efficacy of the original blue LED because of the human eye's greater sensitivity to yellow than to blue ( as modeled in the luminosity function ).
45.
Luminous intensity is analogous to radiant intensity, but instead of simply adding up the contributions of every wavelength of light in the source's spectrum, the contribution of each wavelength is weighted by the standard luminosity function ( a model of the sensitivity of the human eye to different wavelengths ).
46.
The sensitivity of the dark-adapted human eye is greatest at about 507nm, a blue-green color, while the light-adapted eye is most sensitive about 555nm, a yellow-green; these are the peak locations of the rod and cone ( scotopic and photopic, respectively ) luminosity functions.
47.
:: The achromat lens had to wait for the mid-1700s but the article doesn't seem to mention anyone trying looking at at least the very bright Moon or planets through yellow stained glass ( that color appearing brightest and closest to white due to the luminosity function, or Newtonian reflectors obsoleting 300-foot refractors.
48.
:And please keep in mind that the maximum "'theoretical "'efficiency of a light source is 683 lumens / watt for a monochromatic green source at 555 nm; see Luminosity function . "'NO WHITE LIGHT SOURCE "'can approach this value because your eyes become less and less sensitive as you move away from your eyes'peak sensitivity at 555 nm.
49.
As shown below, it is beneficial, but not sufficient, to shape the luminance response to simulate that of the NTSC ( PAL or SECAM ) luminance characteristic ( by, for example, placing an optical filter in front of the luminance tube to pass light with the required luminosity function, or by a special dichroic surface which reflects light to the luminance tube with the required luminosity function ).
50.
As shown below, it is beneficial, but not sufficient, to shape the luminance response to simulate that of the NTSC ( PAL or SECAM ) luminance characteristic ( by, for example, placing an optical filter in front of the luminance tube to pass light with the required luminosity function, or by a special dichroic surface which reflects light to the luminance tube with the required luminosity function ).
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