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    1. Architectural Lighting
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    Lexedis unveils high-CRI powerXED emitter

    Nov. 16, 2007
    Lexedis Lighting has developed a tri-band phosphor that enables Ra of 90 in warm white, with good rendering of red colors.
    Content Dam Leds En Articles 2007 11 Lexedis Unveils High Cri Powerxed Emitter Leftcolumn Article Thumbnailimage File
    Powerxed1

    Small form-factor Lexedis has launched its powerXED emitter, delivering up to 60 lumens for cool white at a rated current of 350 mA.

    The warm-white version of the device has a color rendering index (Ra) of up to 90, thanks to the use of a tri-band phosphor. Lexedis has branded this as indeXED 90.

    The powerXED is available in four standard correlated color temperatures (CCT) of 3000 K, 4200 K, 5700 K and 6500 K. The product takes advantage of Zero Colour Binning developed by Lexedis; the company says this ensures that, at any value of CCT, there is no discernable difference in color temperature and color rendition between different LEDs.

    The package has a very small form-factor, measuring 2.5 mm x 2.5 mm x 0.6 mm, the same as the company's nanoXED emitter. The chip-in-silicon packaging with good thermal properties, and the use of all-inorganic materials ensures durability, reliability and a long service life in excess of 50,000 hours. The powerXED has a 120° Lambert beam pattern.

    Powerxed2
    powerXED spectrum For powerXED, Lexedis has developed a three-band phosphor (see spectrum). Lexedis says that, unlike other one-band or two-band phosphors, the new phosphor provides good long-term stability, a good light output ratio and a large red component (R12). The absence of a red com¬ponent in other phosphors leads to an unsatisfactory color ren¬dition of red tones even with a high overall Ra value.

    The device’s high Ra is expected to fulfill the requirements of architects, lighting designers and lighting engineers for high-performance light sources by exceeding the Ra of 70-80 prevalent in fluorescent lighting

    The high-CRI powerXED emits a quality of natural light which makes it a suitable choice for application in retail, medical and dental lighting as well as both linear architectural and façade lighting applications.