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be based on the above analysis: When the forward current is small, although the chip itself, higher luminous efficiency, led fluorescent light but because the intensity is too weak, while the phosphor coating the chip has a certain thicknessled fluorescent light , the chip issue Blu-ray can only be excited close to the chip surface, a small part of the phosphor, and this part of the production of yellow phosphor is excited, led fluorescent light most of it was absorbed by the phosphor coating, this time not only low luminous efficiency, and luminous yellowish color. With the increase in IF, led fluorescent light although the chip light-emitting efficiency decreased slightly, but the emission intensity increased significantly at this time, led fluorescent light given the blue chips can penetrate the phosphor layer, making the phosphor layer, in particular the phosphor coating greatly increased chance of being excited, luminescence intensity increased rapidly.