White LEDs can also be made by coating near-ultraviolet (NUV) LEDs with a mixture of high-efficiency europium-based phosphors that emit red and blue, plus copper and aluminium-doped zinc sulfide (ZnS:Cu, Al) that emits green. This is a method analogous to the way fluorescent lamps work. This method is less efficient than blue LEDs with YAG:Ce phosphor, as the Stokes shift is larger, so more energy is converted to heat, but yields light with better spectral characteristics, which render color better. Due to the higher radiative output of the ultraviolet LEDs than of the blue ones, both methods offer comparable brightness. A concern is that UV light may leak from a malfunctioning light source and cause harm to human eyes or skin.
The method of coating NUVs less efficient than what other LEDs?
blue

By the 2000 census, demographic changes including the end to slavery, immigration from Europe and Asia, assimilation of multiracial persons, and other factors resulted in a population in which 6.2% of the population identified as black, 40% as pardo, and 55% as white. Essentially most of the black population was absorbed into the multi-racial category by intermixing. A 2007 genetic study found that at least 29% of the middle-class, white Brazilian population had some recent (since 1822 and the end of the colonial period) African ancestry.
How much of the Brazilian population had connections to African ancestry in 2007?
29%

The early Manchu rulers also established two foundations of legitimacy which help to explain the stability of their dynasty. The first was the bureaucratic institutions and the neo-Confucian culture which they adopted from earlier dynasties. Manchu rulers and Han Chinese scholar-official elites gradually came to terms with each other. The examination system offered a path for ethnic Han to become officials. Imperial patronage of Kangxi Dictionary demonstrated respect for Confucian learning, while the Sacred Edict of 1670 effectively extolled Confucian family values. The second major source of stability was the Central Asian aspect of their Manchu identity which allowed them to appeal to Mongol, Tibetan and Uighur constituents. The Qing used the title of Emperor (Huangdi) in Chinese while among Mongols the Qing monarch was referred to as Bogda khan (wise Khan), and referred to as Gong Ma in Tibet. Qianlong propagated the image of himself as Buddhist sage rulers, patrons of Tibetan Buddhism. In the Manchu language, the Qing monarch was alternately referred to as either Huwangdi (Emperor) or Khan with no special distinction between the two usages. The Kangxi Emperor also welcomed to his court Jesuit missionaries, who had first come to China under the Ming. Missionaries including Tomas Pereira, Martino Martini, Johann Adam Schall von Bell, Ferdinand Verbiest and Antoine Thomas held significant positions as military weapons experts, mathematicians, cartographers, astronomers and advisers to the emperor. The relationship of trust was however lost in the later Chinese Rites controversy.
Who did the Manchu appeal to?
Mongol, Tibetan and Uighur