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Today LED lighting solutions achieve high colour rendering in excess of Ra 90, and hence are more sophisticated than many solutions using fluorescent lamps. Even the colour rendering levels of discharge lamps are achieved, as are other technical lighting properties. For Zumtobel's high-quality products, LEDs produced by various manufacturers are used. In addition, Zumtobel collaborates closely, and in some cases exclusively, with LED and LED module manufacturers, such as Cree, Philips, Osram etc.; this ensures the integration of the latest technologies at an early stage of new product developments. As regards colour rendering of LEDs, the following indications are of key importance: Normative colour rendering in the warmer colour temperature range is usually higher with single-chip LEDs with a blue dye (light-emitting component) and yellow phosphor.
Colours should be rendered as naturally as possible by choosing the corresponding phosphor mixes. Unfortunately, the efficiency of warm white LEDs is usually lower than that of intermediate and cool white LEDs. For a cooler colour temperature, the phosphor mix is changed. LEDs with cooler light colours are usually more efficient, but their colour rendering index is also lower. By mixing white light through LEDs of different light colours, excellent colour rendering can be achieved with simultaneously high efficiency.