Currently, the color rendering index of warm white or neutral white LEDs on the market is usually low. Various methods are used to increase the color rendering index, usually accompanied by loss of light efficiency. For example, when CRI > 90, the light efficiency usually does not exceed 75 lm / W.
Osram's Hybrid LED, called Brilliant Mix, offers high-end retail products with high color rendering and high light efficiency. The method is: the monochrome LED (amber) is juxtaposed next to the blue LED excited by the phosphor, and is packaged in the form of multi-chip COB or multi-chip array, and the luminous efficacy of the lamp can be increased to 90 lm in the case of 2700K. /W (the corresponding LED chip can achieve 110lm/W).
However, there are two points to note when adopting this method: 1. Use an optical mixing chamber to improve color consistency; 2. The correlated color temperature will change with temperature. Installing photosensitive elements and temperature sensors can improve stability, but compensation is also needed. Circuit.
Osram said that the color mixing method is absolutely superior to the overdrive method because the latter causes LED failure. In addition, a compromise can be used, that is, by adjusting the ratio of monochromatic light and PC-LED driving, to achieve moderate color rendering and light efficiency. In terms of color-mixed LED patents, Osram and Cree have now obtained cross-licensing.
Osram's Hybrid LED, called Brilliant Mix, offers high-end retail products with high color rendering and high light efficiency. The method is: the monochrome LED (amber) is juxtaposed next to the blue LED excited by the phosphor, and is packaged in the form of multi-chip COB or multi-chip array, and the luminous efficacy of the lamp can be increased to 90 lm in the case of 2700K. /W (the corresponding LED chip can achieve 110lm/W).
However, there are two points to note when adopting this method: 1. Use an optical mixing chamber to improve color consistency; 2. The correlated color temperature will change with temperature. Installing photosensitive elements and temperature sensors can improve stability, but compensation is also needed. Circuit.
Osram said that the color mixing method is absolutely superior to the overdrive method because the latter causes LED failure. In addition, a compromise can be used, that is, by adjusting the ratio of monochromatic light and PC-LED driving, to achieve moderate color rendering and light efficiency. In terms of color-mixed LED patents, Osram and Cree have now obtained cross-licensing.
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