Chromaticity Basics, Calculations, Factors, and Applications

Chromaticity Basics: Factors, Calculation, and Application

Color is a universal language. At traffic lights around the world, drivers understand to stop on red and go on green. For many signaling applications, including those in the railroad and aerospace industry, operators are trained to recognize and respond to very specific colors. So how do you make sure that your light fixture outputs…

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2015 Year of Light

A Year of Light: Notable Light-based Research and Technologies in 2015

Looking back on 2015, it was a significant year for the lighting and photonics community; it was the year that the world celebrated light. Launched at the start of 2015, the International Year of Light (IYL) was a celebration of light and light-based technologies across the world. One of the main objectives of the IYL…

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UV LED Curing

New Technology Conference Highlights Growth of UV LED Curing

Ultraviolet light emitting diode (UV LED) technologies are rapidly being adopted and used in a variety of applications; this progression is increasing year-over-year and continues to gain momentum. Significant improvements in the design and reliability of UV LEDs, especially within the UV-A wavelength range (320 – 400 nm), has accelerated their adoption.  The inaugural UV…

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IESALC 2015 Fall Meeting

IESALC 2015 Technology Meeting Highlights: Focus on Safety, New Technologies, FAA LED Update

Total global air travel is increasing year-over-year; in 2014 air travel demand grew by 5.9% compared to 2013 and it has continued to grow through 2015. A substantial transportation infrastructure is necessary to support the growing number of air travelers worldwide. Airports around the world recognize that to increase capacity and to remain competitive, they…

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Transparent Material Comparison, Silicone, Glass, Polycarbonate

The Clear Choice: How to Choose the Best Transparent Material

There are many transparent materials out there for you to consider when designing a lens for a lighting application. Take a look at the image above; these different transparent materials all look fairly similar don’t they? You may be asking yourself “What makes glasses and plastics so different? Which material is right for my lens?”…

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SAE A20 Aircraft Lighting Committee Fall Meeting Highlights: New Standards Published, SWIR Updates, UAS Document Progress

On September 30 through October 1, I attended the SAE A20 Aircraft Lighting Steering Committee’s fall meeting in Salt Lake City, Utah.  The committee consists of representatives from lighting manufacturers, aircraft manufacturers, the Federal Aviation Administration (FAA), SAE, and aerospace lighting consultants.  These meetings offer an excellent opportunity to have open dialog and discussion about…

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How to Design with LEDs

How to Design with LEDs: Iterative Approach Yields Fully Optimized Lighting Systems

While the cost of light emitting diodes (LEDs) is decreasing, they are still relatively expensive and their adoption should be carefully considered before making the switch. Optimization of the optic and other system components can reduce the number of LEDs needed and reduce the overall cost of the LED lighting fixture. Solid state lighting (SSL)…

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Mechanical Properties of Glass

Mechanical Properties of Glass: Design to Survive Stress, Impact, and Abrasion

When designing a lens for a harsh environment, you need to choose a material that is resistant to pressure, abrasion, and impact. Some applications, such as exterior aircraft lighting, can push a material to its limits. Exterior aircraft lenses are exposed to smog, dust, and other air pollutants at very high speeds; the resulting impacts…

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LED Useful Life

Challenges of Determining LED Useful Life

The transition to light emitting diodes (LEDs) from conventional light sources brings several new challenges to lighting engineers and designers. LEDs are much different than incandescent bulbs, especially in terms of useful life. It’s easy to determine the useful life of an incandescent lamp; if the light goes out, its useful life is over. This…

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Optical Properties of Glass

Optical Properties of Glass: How Light and Glass Interact

This is the second article in a three-part series that reviews the thermal, optical, and mechanical properties of glass. We will define common glass properties and explain their application and importance in component design. We often hear from engineers who are evaluating the impact of a design change from one lens material to another. For…

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