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LumiLeds Lighting has expanded its Luxeon series
with a 5-W white LED that generates 120 lumens
(lm). It occupies the same footprint as LumiLeds'
1-W Luxeon, which generates about 30 lm of white
light.
Essentially, the 5-W model combines the equivalent
of four 1-W Luxeon chips in the same size package.
The four chips are configured in a 2-by-2 matrix
so there are two pairs of series-connected LEDs
in parallel. As a result, the 5-W LED draws twice
the operating current (750 mA) and exhibits twice
the [V.sub.F] (7 V) of the 1-W LED.
The LED is available in a single-emitter configuration
premounted on an aluminum-core pc board. Applications
include accent, task, emergency, and landscape
lighting. The LED's color rendering index (CR1)
is around 70, but development of an improved phosphor
should raise that value in another year.
In the meantime, users can combine red, green,
and blue versions of the Luxeon to achieve a CRI
greater than 90. In addition to these colors,
the LED will be available in cyan and royal blue.
Outputs range from 30 lm for blue to 130 lm for
green and cyan. The 5-W Luxeon costs $0.10 per
lumen or roughly $10 per LED in OEM quantities.
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