| http://www.w3.org/ns/prov#value | - When the white LED illumination is put to practical use, since efficiency of converting electric energy into light is improved, less heat is generated and it is constituted of the LED and a phosphor, the white LED has advantages of good life span without burn-out of a filament as is seen in a conventional incandescent bulb and the harmful substance such as mercury is not contained, and miniaturiza
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