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Similar to fluorescent lights, HMIs present problems with color temperature when used for film or video lighting applications.Unlike incandescent-lighting units, which are blackbody radiators limited to a theoretical maximum of 3680 K (the melting point of tungsten), HMI lamps, like all gas discharge lighting, emit the emission spectral lines of its constituent elements, specifically chosen so ...
Cork Electric Tramways and Lighting Company; opened 1898, closed 1931 [9] Norway: Used by the Germans up to 1945, called Feldbahn (field railway), for industrial plants or other temporary uses. In Norway during the WW II the Germans built a 15 km (9.3 mi) railway between the harbour at Årdalstangen and the industrial plant of Øvre Årda. It ...
The ultraviolet light from mercury-vapor lamps was applied to water treatment by 1910. The Hewitt lamps used a large amount of mercury. In the 1930s, improved lamps of the modern form, developed by the Osram-GEC company, General Electric company and others led to widespread use of mercury-vapor lamps for general lighting.
These lamps are used for fluorescence effects where less visible light is ideal. 09 N/A Sun-tanning lamps: These lamps produce wide or narrow band UV-B radiation 10 BL Black-Light lamps: Black light lamps give off long-wave UV-A radiation of around 350-400 nm. They are often used to attract insects to traps.
On October 7, 2015, the Commercial division of GE Lighting was separated from the business and a new startup, Current, was created. [9] On July 1, 2020, GE Lighting was acquired by Savant Systems, a home automation company headquartered in Hyannis, Massachusetts, United States. [10] This was General Electric's last consumer business. [11]
Diagram of Lambertian diffuse reflection. The black arrow shows incident radiance, and the red arrows show the reflected radiant intensity in each direction. When viewed from various angles, the reflected radiant intensity and the apparent area of the surface both vary with the cosine of the viewing angle, so the reflected radiance (intensity per unit area) is the same from all viewing angles.
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