We investigated the dependence of luminous efficiency on background chromaticity by measuring 25-Hz heterochromatic flicker photometry (HFP) matches in six genotyped male observers on 21 different 1000-photopic-troland adapting fields: 14 spectral ones ranging from 430 to 670 nm and 7 bichromatic mixtures of 478 and 577 nm that varied in luminance ratio. Each function was analyzed in terms of t...

Interest has centered for a long time on the intensity and efficiency of animal luminescence, not only from a theoretical but also from a practical standpoint. With the exception of the beetles, most luminous animals emit light in such small amounts that adark-adaptedeye is required to register their intensities. I t is a difficult matter to measure accurately low light intensities, especially ...

Interest has centered for a long time on the intensity and efficiency of animal luminescence, not only from a theoretical but also from a practical standpoint. With the exception of the beetles, most luminous animals emit light in such small amounts that adark-adaptedeye is required to register their intensities. I t is a difficult matter to measure accurately low light intensities, especially ...

We used the minimum motion method devised by Anstis and Cavanagh (1983) to measure the luminous efficiency of red and green and of yellow and blue for "normal" 1- 3-month-old babies and for one 3-month-old boy destined to be color-deficient because of a deutan mother. Subjects watched a display which created apparent motion, the direction of which depended on the relative luminance of the color...

The relation between the central mass and quasar luminosity (MBH ∝ L α FHWM ) links a given Eddington ratio with a value of H0, within a cosmology with fixed (Ωm,ΩΛ). We point out that because the relation is calibrated at low z using distance independent reverberation mapping to get the BLR size, the derived MBH interestingly does not depend on H0, while L/LEdd is sensitive to H0, but rather r...