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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 tubes. LED tube is a type of LED lamp used in fluorescent tube luminaires with G5 and G13 bases to replace traditional fluorescent tubes. [1] As compared to fluorescent tubes, the most important advantages of LED tubes are energy efficiency and long service life. LED tubes are sometimes also referred to as ‘LED fluorescent tubes’.
BEIJING — China's government on Sunday denounced the Trump administration's imposition of a long-threatened 10% tariff on Chinese imports while leaving the door open for talks with the U.S. that ...
The Surface Pro 7 is a 2-in-1 detachable tablet computer developed by Microsoft.It is the seventh generation of Surface Pro and was announced alongside the Surface Laptop 3 and Surface Pro X at an event on 2 October 2019. [1]
Although smaller than the Bomber D designs that led to the Douglas XB-19, the new designs required just as much power. When four preliminary designs were presented in mid-1940, three of them used the R-3350. Suddenly development was a priority, and serious efforts to get it into production began.
Nicholas, unbreeched at two years old, with his mother, Maria Feodorovna, in 1870 Grand Duke Nicholas was born on 18 May [O.S. 6 May] 1868, in the Alexander Palace in Tsarskoye Selo south of Saint Petersburg, during the reign of his paternal grandfather, Emperor Alexander II.
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