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In general all white LEDs are blue ones with a phosphor coating on the top. This phosphor absorbs the blue light and then emits white light. This phosphor is bonded directly on the blue LED chip. In a remote phosphor system the phosphor is suspended mechanically above the blue LED emitting surface and recycles extracting forward and recycled photons as white light.The phosphor recipe is mixed to provide the colour temperature. As the blue light passes through the phosphor they are converted in to smooth homogenous white light with excellent colour consistency. This provides an unparalleled linear lighting product with energy efficiency levels and low shadow conversion in like standard LED products

Here we compare the VEX-DOMELINE with a typical linear LED to explain further;

Remote Phosphor vs Standard LED Linear

Remote Phosphor DOMELINE vs Typical LED Linear Luminaire