LED Lighting Enables Better Sleep and Wake Cycles

LED technology helps astronauts sleep and keeps gardens growing.

Because NASA is planning for future visits to distant locations like Mars, the agency is researching how to grow plants in space. Live plants on space missions provide a nutritious food source and contribute to cleaning air in a spacecraft. When looking at how to best grow plants on space missions, NASA looked at high-intensity halogen lights, special UV bulbs, and light-emitting diodes (LEDs). By incorporating different LEDs on a single circuit board, the light can be changed and controlled to include or omit specific wavelengths of light, and at different times.

Posted in: Articles, Spinoff, Aerospace, LEDs, Lighting, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Biological sciences, Human factors, Medical, health, and wellness, Spacecraft

State-of-the-Art Testing for LED Lamps and Luminaires

Unlike previous lighting requirements, LED testing has become more stringent and complicated, and involves a significant number of tests for various lighting characteristics. From measuring lumen output, efficacy, correlated color temperature (CCT), color rendering index (CRI), and photometrics to calculating life spans, MaxLite has advanced its rigorous procedures of testing and inspection in the new world of solid-state lighting.

Posted in: Articles, Lighting, Test & Inspection, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Test procedures

Fluid Dispensing Solutions for LEDs

LED lighting is popular because many governments are banning incandescent bulbs to save energy and carbon dioxide, especially for general lighting. In the automotive industry LEDs are being used because they save energy and costs, especially with the migration to hybrid cars and electric vehicles, and because the flexible LED light shape creates cool designs. These applications have created a need for more precise and accurate fluid dispensing as well as the dispensing of some fluids that require special attention. These dispensing applications must take into account:

Posted in: Articles, Lighting, Materials & Packaging, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Pumps

Choosing the Right Circuit Protection for LEDs

Approximately 25 percent of global energy consumption goes to lighting applications, so making lighting more energy-efficient could have a dramatic impact on overall energy usage or make more power available for other uses. Legislation designed to discourage the use of incandescent lamps has been a significant factor in the growth in demand for LED lighting equipment. At the same time, both consumers and industrial users are increasingly interested in energy-efficient lighting options, further stimulating the demand for LED lighting.

Posted in: Articles, LEDs, Lighting, Powering & Controlling LEDs, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Energy conservation

Heat Pipe Solutions for LED Devices

By Peter Ritt and Daniel Reist, Advanced Cooling Technologies (ACT), Lancaster, PA

LEDs are experiencing increasing acceptance and growth across many market segments. Part of this growth is due to new, higher-power LEDs that can be packaged in increasingly small areas. However, increased power places greater importance on thermal management because of the negative effect that heat has on LED performance.

Posted in: Articles, Lighting, Powering & Controlling LEDs

LED Phosphor Application

By Mark Tuttle, SemiLEDs Optoelectronics Co., Ltd.

The most common, and cost-effective, method of delivering white light from an LED is to combine a blue “pump” LED source under a layer of phosphor or phosphor blends to achieve the desired spectrum. While there are relatively few manufacturers of high-quality blue LED die, there are a substantial number of companies that purchase those raw blue die and package them into finished white LEDs, ready for sale and eventual integration into a luminaire or replacement lamp, signage, or backlight, such as we see in our smartphones, laptops, and flat panel TVs.

Posted in: Articles, Lighting, Manufacturing & Prototyping

Liquid Cooling Technology for LEDs

Best quality LED A-lamp light bulbs provide a superior, energy-efficient alternative to incandescent bulbs, which have essentially been banned as of January 1, 2014. LED bulbs offer the same amount of light as an incandescent while using up to 80 % less energy. There still remains, however, a wide discrepancy in performance between LED bulbs and what consumers expect from them as alternatives to standard incandescent bulbs. This variation in performance and cost can be largely attributed to how specific LED bulb manufacturers solve the challenge of removing heat from the LED components within their bulbs.

Posted in: Articles, Lighting, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Cooling

Finding the Optimal Lighting Solution for Line-Scan Applications

In machine vision systems, acquiring images of moving targets is a challenge and consequently the best image requires three fundamentals to be well defined:

an excellent camera; an appropriate lens; an appropriate illumination.

All three items are the key to enable subsequent successful image analysis, while poor image quality will task any machine vision application.

Posted in: Articles, Lighting, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Automation, Computer integrated manufacturing

Manufacturing LED Modules and Components

Technical Challenges

Several technical challenges exist when manufacturing solid state lighting (SSL) modules and components. The greatest challenge is in keeping up with the changes in LED technology. LED components, such as LED packages and chips, are improving in lumen output, luminous efficacy, and thermal performance at a staggering rate. A successful LED manufacturing organization needs to keep up with these improvements and allot time for educating its employees on new technologies and incremental improvements to LED packages and LED die. Figure 1 shows the luminous efficacy (lumens per watt) of various lighting technologies and their projected improvement through 2020. As you can imagine, staying abreast of the latest technology when it is improving so rapidly is like trying to hit a constantly moving target.

Posted in: Articles, LEDs, Lighting, Light emitting diodes (LEDs), Light emitting diodes (LEDs), Parts

High Performance Thermal Management Solutions for LEDs

When it comes to highpower lighting applications in the military and harsh industrial environments, reliability and efficiency are key features to consider. To maximize both of these qualities, lightemitting diode (LED) technology is coming into play with brighter, more flexible lighting solutions. LEDs are longer-lasting, appear brighter and are more versatile and more durable than incandescent and compact fluorescent lighting (CFL).

Posted in: Articles, Lighting

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