mouser.com/te 21
same light. The stage director can illuminate certain
cast members or stage directions by using an
assortment of smaller lights while leaving the others
in darkness. Since light pollution is particularly
problematic in large urban centers and areas, LED
lighting might make stargazing from the streets of
major metropolitan areas possible again.
Efficient lighting often requires tight consistency
from LED to LED so that LEDs used within a fixture
and in multiple fixtures all have the same color and
output levels. For example, consider the LUXEON
HL2X high-power LED. This illumination grade
multi-die LED is designed for outdoor and industrial
applications targeting either high efficiency or low
cost. To deliver color consistency from LED to LED,
every Lumileds LUXEON HL2X LED fall within a
single 3- or 5-step MacAdam ellipse centered in
ANSI (American National Standards Institute) to
ensure color consistency. This results in high efficacy
and high flux density with tightly correlated color
temperature control from a uniform source. This
level of consistency and uniformity makes it possible
to create sizeable outdoor lighting systems that can
meet challenging illumination requirements. For
example, drivers won't be exposed to bright/hot
spots that distract them or low-lighting levels that
make it hard to see the road, pedestrians, or other
vehicles.
LUXEON HL2X LEDs
are designed and tested
with consistency at the top
of mind. Lumileds was the first
supplier to adopt hot-testing, in
combination with a tight elliptical color
bin structure, during the production of
high-power LEDs. This requires state-of-the-
art testers and sophisticated algorithms that
carefully match the LED's epi and phosphor
materials to ensure tight color consistency
within a product family. In practical terms,
the light output, forward voltage, and color
point of Lumileds LEDs are guaranteed
within a tight set of bounds at a junction
temperature of 85°C, allowing LED system
designers to better predict their application's
performance. This ensures developers need
not resort to additional testing, or 'binning,'
to guarantee LEDs meet tight consistency
requirement, reduces engineering efforts,
improves time-to-market, and results in more
efficient and pleasing lighting solutions.
Lighting consistency can be a significant
contributing factor to a green installation.
Only the right amount of light, and therefore
power, is needed to deliver the safety and
reliability outdoor systems demand.
