Light luminances

ISO 9241-305 2008 ergonomics of human-system interaction—part 305 optical laboratory test methods for electronic visual displays Determination of the reflected light, luminous density measurement... 

Kopelman R, Tan Wand Birnbaum D 1994 Subwavelength spectroscopy, exciton supertips and mesoscopic light-matter interactions J. Lumin. 58 380-7... 

Guttler F, Sepiol J, Plakhotnik T, Mitterdorfer A, Renn A and Wild U P 1993 Single molecule spectroscopy fluorescence excitation spectra with polarized light J. Lumin. 56 29-38... 

Zinc sulfide is used in making luminous dials. X-ray and TV screens, and fluorescent lights. 

Luminance is the luminous intensity divided by the area of emission of light (Iumens/steradian/m2). This is the power density emitted per unit area. 

The luminance relates to the luminous intensity radiated from an entire surface of a light source ... 

Some examples of approximate luminances of various light sources are given in Table 18.1. 

Some Approximate Luminances of Various Light Sources... 

The amount of light emitted by a source is measured by its luminance or by its luminous intensity, which are defined in Figure 18.2. Intrinsic light emission relates to the amount of light emitted per unit area (luminance). Table 18.1 lists approximate luminances for some common light sources. 

The regions of space where molecules have been detected are the nebulae which are found not only in our own galaxy but also in other galaxies. In our galaxy the nebulae are found in the Milky Way, which appears as a hazy band of light as a result of its containing millions of stars. Associated with the luminous clouds composing the nebulae are dark clouds of... 

Pig. 11. Luminous performance vs peak emission wavelength for the best reported high brightness LEDs. Some high performance lighting sources are indicated. The numbers in parentheses correspond to the source wattage. Also shown is the (—) eye response curve (as defined by the Commission... 

The brightness and lifetime limits of a formulation are determined by its light capacity, in (Imh)/L, which is defined as the integral of luminous intensity I, in lumens, with respect to reaction time /in hours for one Hter of formulation (237) ... 

The GIE Standard Observer. The CIE standard observer is a set of curves giving the tristimulus responses of an imaginary observer representing an average population for three primary colors arbitrarily chosen for convenience. The 1931 CIE standard observer was deterrnined for 2° foveal vision, while the later 1964 CIE supplementary standard observer appHes to a 10° vision a subscript 10 is usually used for the latter. The curves for both are given in Eigure 7 and the differences between the two observers can be seen in Table 2. The standard observers were defined in such a way that of the three primary responses x(X),jy(X), and X), the value ofjy(X) corresponds to the spectral photopic luminous efficiency, ie, to the perceived overall lightness of an object. 

Substances that are intrinsically fluorescent can often be exeited with long-wavelength UV light. They absorb the radiation and then emit, usually in the visible region of the spectrum, so that they appear as bright luminous zones, whieh can frequently be differentiated by color. They, thus, set themselves apart from the multitude of substances that only exhibit absorption. This detection possibility is characterized by high specificity (Sec. 2.3). 

Leucht-erscheinung, /. luminous phenomenon, -faden, m. luminous filament glow column light streamer. 

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