what are led light bulbs and white led

what are led light bulbs? The white LED lights source lighting with green, long life, energy saving, small size, light weight, quick to respond, low operating voltage and good safety characteristics, known as the 21st century green replacement for incandescent, fluorescent and energy-saving lamps. LED white light is a variety of ways, are now widely used and has achieved industrialization is the launch of the white phosphor coating on the LED chip. Because LED uses three methods to achieve white light of fluorescent powder, technically does not fully mature, so severely limited the wider application of white LED lighting in the area.

There are 3 different methods to achieve white led, then you could know what are led light bulbs.

The first scenario is Blu-ray excitation of the yellow phosphor coating a blue LED street light chip, the principle is the blue chip issued by the yellow light and fluorescent powder complementary to the formation of white light. However, the principle disadvantage of this program is the phosphor emission spectra of the Ce3 ion with the characteristics of a continuous spectrum, therefore, poor color, luminous efficiency is not high enough, it is difficult to meet the needs of low color temperature lighting, in order to solve this problem must be improved through the development of new highly efficient phosphor.

The second option is the blue LED chip coated with green and red phosphors, the principle is issued through the chip emits blue light phosphor green and red compound obtained white, so color is more better. The drawback is that this program of phosphor conversion efficiency is low, only to improve the efficiency of red phosphors can be improved.

The third program is the three primary colors or multiple color phosphor coating in the violet or ultraviolet LED high bay chip, the principle is the chip launch the long-wave ultraviolet light (was 370nm-380nm) or violet (380nm-410nm ) to stimulate phosphor to achieve white light emission color of this program to be better than the previous two programs, but the effective conversion efficiency of the phosphor is also low, and red and green phosphors generally sulfide system, so this kind of luminescent stability of the phosphor, the light fades larger. Only to develop more efficient, low-light decay of LED phosphors in order to achieve higher conversion efficiency.

what are led light bulbs and white led? After reading this article, you would know.