By David L. Dilaura, Kevin W. Houser, Richard G. Mistrick, Gary R. Steffy
The Bible for a person who's interested by lights. Covers all applied sciences, steered purposes and illuminance thoughts and lots more and plenty, even more. fresh variation.
Read Online or Download The Lighting Handbook: Reference and Application PDF
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Extra resources for The Lighting Handbook: Reference and Application
In the first case, line spectra result, such as those of mercury or sodium discharge. In the second case, such as with light emitting diodes, narrow emission bands result, which cover a portion of the spectrum, usually in the visible region. Two kinds of luminescence are used in modern electric sources. Photoluminescence describes the process by which a substance absorbs a photon (electromagnetic radiation) of a particular wavelength and re-radiates electromagnetic radiation at a longer wavelength.
Fluorescence is the basis of light production in the fluorescent lamp: UV optical radiation produced by an electric discharge in mercury vapor is converted to visible optical radiation by the lamp’s phosphors. See 7 | LIGHT SOURCES: TECHNICAL CHARACTERISTICS. The phosphors used in fluorescent lamps are crystalline inorganic compounds of exceptionally high chemical purity and of controlled composition to which small quantities of other substances (the activators) have been added to convert them into efficient fluorescent materials.
Materials exhibit an index of refraction that changes with wavelength, so the refracted angle depends on wavelength. 4 Interference When two optical radiation waves of the same wavelength come together at different phases of their vibration, they can combine to make a single wave. If the phases are opposite the waves subtract and the resulting amplitude is the difference of the two amplitudes, possibly zero. If the phases are the same the waves add and the resulting amplitude is the sum of the two amplitudes.