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Lime-Green LEDs Encourage Color-Tunable Lighting

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  Lime-Green LEDs Encourage Color-Tunable Lighting

  有两种建立方式:使用LED产生白光由红、绿混合排放,和蓝(RGB)芯片(见高新区的文章“加不减–色”创造白光),或结合一个蓝色的装置与黄色荧光粉(见高新区的文章“洁白,明亮的LED“)。这两种方法工作得很好,但后者更受欢迎,因为该系统具有更高的功效。

  然而,结合RGB发光二极管的优势在于,它允许制造商引进颜色可调固态照明,这反过来又使消费者能够快速,轻松地改变房间的氛围。例如,卧室里的灯光可以由黄白色变成粉红色,以促进睡眠。

  然而,尽管RGB LED照明的颜色可调的性质,它可能仍然是一个新颖的,直到绿色LED的功效提高到匹配的蓝色和红色的设备,因为消费者不太可能妥协他们的电费只是为了花哨的照明。幸运的是,改变正在进行中。制造商,尤其是飞利浦Lumileds公司,引入新的解决方案,克服缺点,把绿色LED RGB LED照明成为一个实践命题。

  Lime-Green LEDs Encourage Color-Tunable Lighting

  Quantum inefficiency

  While RGB LED-based products are likely to gain some market share due to the “fun factor” of color tunability, in their present form they are not going to challenge blue LED/yellow phosphor white LEDs for mainstream lighting applications because their efficacy is lower.

  Efficacy (lm/W) is something of a Holy Grail for LED makers because it is a major differentiator between solid-state lighting and traditional lighting (see the TechZone article “What‘s Next for High-Power LEDs?”)。 LEDs are now so optimized they are beginning to challenge even fluorescent tubes (which exhibit an efficacy of 50 to 100 lm/W)。 Cree has recently introduced a white LED from its Xlamp XM-L family, which produces 123 lm/W (at a forward voltage of 2.9 V and forward current of 700 mA)。

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