By T. Q. Khan, P. Bodrogi, Q. T. Vinh, H. Winkler

ISBN-10: 3527412123

ISBN-13: 9783527412129

Selling the layout, program and assessment of visually and electrically powerful LED mild assets and luminaires for common indoor lights in addition to outdoors and car lights, this e-book combines the data of LED lighting fixtures know-how with human perceptual points for lighting fixtures scientists and engineers.
After an advent to the human visible process and present radiometry, photometry and colour technological know-how, the fundamentals of LED chip and phosphor know-how are defined via particular problems with LED radiometry and the optical, thermal and electrical modeling of LEDs. this is often supplemented by way of the proper useful problems with pulsed LEDs, distant phosphor LEDs and the getting older of LED gentle resources. appropriate human visible features heavily on the topic of LED expertise are defined intimately for the photopic and the mesopic variety of imaginative and prescient, together with colour rendering, binning, whiteness, Circadian matters, in addition to flicker notion, brightness, visible functionality, conspicuity and incapacity glare. the subject of LED luminaires is mentioned in a separate bankruptcy, together with retrofit LED lamps, LED-based street and road luminaires and LED luminaires for museum and college lighting fixtures. particular sections are dedicated to the modularity of LED luminaires, their getting older and the making plans and assessment equipment of latest LED installations. the total is rounded off by means of a precis and a glance in the direction of destiny developments.

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In the photoreceptors of the retina, light signals are converted into neural action potentials. The neuronal layers of the retina preprocess these signals and forward them through the optic nerves toward the so-called LGN (lateral geniculate nucleus). Nerve fibers from the two eyes cross (partially) in the so-called chiasma (opticum). About 90% of the visual nerves (also called optic nerves) reach the visual cortex (containing the processing units of the different visual sensations and interpretations like motion, color, spatial LED Lighting: Technology and Perception, First Edition.

KGaA, Berlin, 2004. 2 Color Appearance, Chromatic Adaptation, Color Spaces, and Color Appearance Models Although color stimuli can be fully described in the system of tristimulus values (X, Y , and Z), this description yields a nonuniform and nonsystematic representation of the color perceptions corresponding to these color stimuli. The psychological attributes of the perceived colors (lightness, brightness, redness–greenness, yellowness–blueness, hue, chroma, saturation, and colorfulness) cannot be expressed in terms of XYZ values directly.

11) The corresponding photometric quantity is luminance (Lv , unit: cd m−2 ) as defined by Eq. 12). 13 illustrates the concept of radiance (Le ). 13, radiance has relevance to a specific direction (2: direction of the detector) and a specific (small) surface (dA) on the light source or the luminaire that emits electromagnetic radiation. As light sources and luminaires are spatially extended objects that radiate nonuniformly, in a general case, their radiance depends on the point on their surface which is considered.

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LED Lighting: Technology and Perception by T. Q. Khan, P. Bodrogi, Q. T. Vinh, H. Winkler

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