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In CC drivers, the voltage changes while the current stays the same. CC drivers are used when the electrical load of the LED circuit is either unknown or fluctuates, for example, a lighting circuit where a variable number of LED lamp fixtures may be installed. As an LED heats up, its voltage drop decreases (band gap decrease [1]). This can ...
LED power dissipation is modeled as a current source; thermal resistance is modeled as a resistor; and the ambient temperature is modeled as a voltage source. High power light-emitting diodes (LEDs) can use 350 milliwatts or more in a single LED. Most of the electricity in an LED becomes heat rather than light – about 70% heat and 30% light. [1]
As illustrated by a straight line on the chromaticity diagram, simple two-white blends will have a pink bias, becoming most severe in the middle. A small amount of green light, provided by another LED, could correct the problem. [41] Some products are RGBWW, i.e. RGBW with tunable white. [42] A final class of white LED with mixed light is dim ...
A light fixture (US English), light fitting (UK English), or luminaire is an electrical lighting device containing one or more light sources, such as lamps, and all the accessory components required for its operation to provide illumination to the environment. [1] All light fixtures have a fixture body and one or more lamps.
On August 27, 2014, the DOD awarded a $38 million contract to Navistar Defense to restore MRAP Maxx Pro Dash vehicles to "like-new" standards. The DOD reported that Navistar was the only bidder. The work includes adding independent suspension systems and replacement of mandatory parts, with an estimated completion date of June 30, 2016.
The Battle of Shanghai (traditional Chinese: 淞滬會戰; simplified Chinese: 淞沪会战; pinyin: Sōng hù huìzhàn) was a major battle fought between the Empire of Japan and the Republic of China in the Chinese city of Shanghai during the Second Sino-Japanese War.
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