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Diagram of a high-pressure sodium lamp A high-pressure sodium lamp, Philips Master SDW-T 100W. Various types of chemistry are used in the arc tubes of HID lamps, depending on the desired characteristics of light intensity, correlated color temperature, color rendering index (CRI), energy efficiency, and lifespan.
The fluorescence of certain rocks and other substances had been observed for hundreds of years before its nature was understood. One of the first to explain it was Irish scientist Sir George Stokes from the University of Cambridge in 1852, who named the phenomenon "fluorescence" after fluorite, a mineral many of whose samples glow strongly because of impurities.
Kamar Gelap was released on December 19, 2008, [1] [5] by Aksara Records. [3] The band claimed they captured social incidents and translated it into music. [6] To perfect it, they hired photographers to make interpretative photos of their songs. [3] On CD version, there is a fusion of the personnel's faces. [2]