White LED lighting need to be spectroscopic and color-separated before leaving the factory (LEDs that have not passed through the color-separation color separation are pure white, some are bluish, and some are yellow). In general, small factories do not have this kind of equipment, so white light produced is usually obtained from large factories for spectroscopic separation. Since it is not a product of its own factory, spectroscopic separation is not as careful. Some small factories simply do not distinguish between colors. They generally pull customers at low prices.