Experiments could aid development of accurate CRI for LED light sources.

Solid-state lighting (SSL) is increasingly being introduced into the market and it is expected that many of the light sources currently used for general illumination will be replaced by light-emitting diodes (LEDs) in the future. As the spectra of LED sources are dissimilar to traditional incandescent and discharge lamps, some of the existing standards and measurement methods are insufficient or deficient when applied to LEDs. For example, a new metric for color rendering of light sources is being developed to address the problems of the color rendering index (CRI) for LED light sources. Such studies require well-designed vision experiments.
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New technology combines the benefits of a LED and a laser.

InfiniLED’s latest MicroLEDs (μLEDs) have produced record optical beam intensity. This new device is capable of producing up to 1mW of light from a single 20μm pixel at 405nm. This is equivalent to a light output density of more than 300 W/cm2 — the high cm2 est recorded for a commercially available LED type device.
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Record-setting “optical phased arrays” could lead to better laser rangefinders, smaller medical-imaging devices and even holographic TVs.

If you want to create a moving light source, you have a few possibilities. One is to mount a light emitter in some kind of mechanical housing — the approach used in, for example, theatrical spotlights, which stage hands swivel and tilt to track performers. Another possibility, however, is to create an array of light emitters and vary their “phase” — the alignment of the light waves they produce. The out-of-phase light waves interfere with one another, reinforcing each other in some directions but annihilating each other in others. The result is a light source that doesn’t move, but can project a beam in any direction.
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As specifiers and end users began moving away from incandescent lighting three decades ago, they started utilizing high intensity discharge (HID) and compact fluorescent (CFL) lamps and fixtures for most commercial lighting applications. The inherent characteristics of these light sources prevents them from generating effective lighting in the desired areas, which creates wasted energy due to much of the light getting trapped inside the fixture.
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A successful LED system design must be able to transfer the active device’s heat efficiently from its own PN junction to the ambient. This path includes the printed circuit board on which the LED is mounted and the enclosure and/or heatsink. The designer must confirm that housings and shrouds participate efficiently in maintaining a good operating temperature.
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Light emitting diodes (LEDs) are known for their energy efficiency and durability, but the bluish, cold light of current white LEDs has precluded their widespread use for indoor lighting. Now, University of Georgia scientists have fabricated what is thought to be the world's first LED that emits warm white light using a single light emitting material, or phosphor, with a single emitting center for illumination.
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Newspapers are filled with stories describing reductions and removal of street lighting in order to reduce municipal costs. Tackling the tricky questions of when and where to install roadway illumination is a challenge for transportation agencies.
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To provide significant energy savings with optimal lighting quality, JetBlue Airways recently selected MaxLite’s High- Max® High Output compact fluorescent (CFL) lamps for a series of retrofit projects in its Orlando-based hangar and training center. With maintained lumens and crisp color rendering throughout the bulbs’ long 10,000-hour lifetime, MaxLite’s HighMax CFLs were a good match for JetBlue’s retrofit highwattage applications. The self-ballasted lamps are constructed with a large, solid aluminum heat sink for cool operation and high-heat fluorescent U-bend tubes for optimized strength and longevity. The higher wattage models have an on-board internal cooling fan that helps maintain lumen output, color rendering, and reduced wattage consumption.
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GE Lighting LED solutions were recently installed in several locations at Marriott International’s headquarters located in Bethesda, Md. The installations have enriched lighting quality, heightened employee security and improved energy efficiency. Following its corporate campus-wide lighting update, Marriott will use 860,000 fewer kilowatt hours (kWhs) of electricity and save more than $120,000 in combined energy and maintenance costs a year.
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Hoffman Performance Lighting has introduced the firstever PAR64 LED Landing Light, a drop-in replacement for existing Q4559 and Q4559X quartz halogen lamps. The ruggedized PAR64 can be used on a wide range of commercial, civil, law enforcement, aero-medical, and military aircraft. With FAA approval pending, this new landing light technology meets or exceeds all FAA and MIL specifications and is fully qualified to RTCA DO160, MILSTD- 810, MIL-STD-461, and other requirements for both fixed-wing and rotor-craft applications.
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