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LEDs

Carolyn Mathas
Editor
Information on LEDs (light emitting diodes) and their various applications that runs the gamut from individual LED components to LED light teardowns, as well as in-depth technical design articles, regulatory and industry news, and product features.

DOE challenges lighting engineers with PAR38 competition

Here’s a competition launched by the U.S. Department of Energy (DOE) to spur lighting manufacturers to develop super high-quality, high-efficiency LED replacements for two of the most commonly used bulbs. What are you waiting for? Read More...

8000 Lumen LED module unveiled by Cree

The Cree LMH2 8000 lumen LED module is an industry first. The solution, designed for high-ceiling applications, easily replaces and actually obsoletes 150-watt ceramic metal halide (CMH) lamps. Read More...

Bridgelux Replaces High-Pressure Sodium Lamps and Rolls 10-Year Warranty

There’s a new LED module on the block, the Bridgelux Outdoor Lighting Module (OLM) that reduces manufacturing cost of outdoor solid state lighting fixtures by 20% to 20% while lowering power consumption up to 65%. Read More...

Using MCUs in Cell Phone and Tablet Apps

This article discusses the role of MCUs and programmable system-on-chip (PSoC) devices in cell phone and tablet applications. It also evaluates the system limitations and design challenges for these applications. Read More...

LEDs Dead or Alive

Forgive my irreverence. I know this is serious business, but it struck a funny bone. It may be because I have a fever, am sick as a dog, and am coughing myself to death. Read More...

LED yields density, optical control and a 50% smaller size

The XLamp XB-H LED combines a 500+ lumen output and up to 175 lumens/watt efficacy at 1W, 25°C, in a package that at 2.45 mm2 is 50% smaller. Read More...

Planes, trains and LEDs

The unique properties of LEDs offer many advantages throughout the transportation sector. Their benefits go beyond cost, long life and maintenance. Read More...

How to Choose the Correct Topology for LED Drivers

This paper explores the factors that affect topology selection for ultra-low cost, off-line conversion. Read More...

A blimp of LEDs

Sounds like a gaggle of geese, or a dopping of goosanders? What is a blimp of LEDs? It’s a 2,100 sq. ft. LED Lightsign screen on a blimp, courtesy of DIRECTV. Read More...

200 lm/W efficiency barrier smashed

LUXEON LEDs enable highly efficient color mixing by providing a convenient above-blackbody color point with optimal standalone efficiency of 200 lm/W at 350 mA and 85°C. Read More...

Tips & Trends: Solving LED Droop

To date, using quantum wells used in high-power lighting apps suffer a significant loss of efficiency even at low electric currents. As current increases, efficiency suffers (droops) more. Read More...

Sine/Cosine-to-Digital Conversion: Methods and Design Challenges

The choice of a sine/cosine-to-digital conversion method can have a large effect on performance. Speed of conversion, resolution, accuracy, and latency are to be considered, but accuracy of the interpolated position/angle output is not dependent on the SDC converter’s resolution. Read to see what it is dependent upon. Read More...

CXA HD LED arrays deal unmatched lumen density

Cree just came out with three new LED arrays that they say will unlock new LED lighting applications. Read More...

LEDs used for airport spying?

Ever travel to Newark Liberty Airport? Did you know that there are 171 new LED fixtures? That in itself is benign, right? Read More...

Sub-miniature connector provides LED app flexibility

The AUH Series wire-to-board, crimp style, dis-connectable connectors by JST Corporation, provide a subminiature size, design flexibility, and reliable contact construction for high density applications. Read More...

LEDs lead me to pineapple—Oh my!

There’s a Philips pilot program going on called Intelligent Lighting where intelligent LED in-store lighting communicates location-based data to shoppers by way of a smartphone app. Read More...

>> SEE ALL

Design Notes: 60V, Synchronous Step-Down High Current LED Driver

Highly efficient high-power LED controller/driver also facilitates MPPT. Read More...

H-bridge paves new ways for LED lighting

Drive a LED array directly from the AC mains in full-wave current-limited mode to realize a flicker-free, energy-efficient solid-state lamp. Read More...

Pocket white-LED torch is power efficient

This single white-LED torch can be housed in an empty glue-stick tube and has a long rechargeable-battery life. Read More...

An improved offline driver lights an LED string

Keep the current constant and the voltage low for improved power efficiency. Read More...

Photo meter assesses ambient light

When most PN-junction diodes are reverse biased, they will produce a small photovoltaic output as the light level is increased. Read More...

Use an LED matrix horizontally

Using one 5×7 LED matrix horizontally instead of vertically allows the display of two characters instead of one. Read More...

Eight LEDs make a 100-division voltmeter

Use a counter IC to drive two sets of four LEDs. Read More...

An LED's intrinsic capacitance works in a 650-mV LRC circuit

The LED and a discrete inductor form an LC tank circuit. Read More...

LEDs indicate sound level

Build a battery-operated portable meter to measure sound-pressure levels. Read More...

Driver circuit lights architectural and interior LEDs

Hold the current constant and within tolerance. Read More...

>> SEE ALL

Flush-mountable IR LED delivers remote control functionality

Osram Opto Semiconductors has introduced the company's first flush-mountable infrared LED which enables remote control functionality to be incorporated in a lower profile than ever before. Read More...

8000 Lumen LED module unveiled by Cree

The Cree LMH2 8000 lumen LED module is an industry first. The solution, designed for high-ceiling applications, easily replaces and actually obsoletes 150-watt ceramic metal halide (CMH) lamps. Read More...

Bridgelux Replaces High-Pressure Sodium Lamps and Rolls 10-Year Warranty

There’s a new LED module on the block, the Bridgelux Outdoor Lighting Module (OLM) that reduces manufacturing cost of outdoor solid state lighting fixtures by 20% to 20% while lowering power consumption up to 65%. Read More...

LED yields density, optical control and a 50% smaller size

The XLamp XB-H LED combines a 500+ lumen output and up to 175 lumens/watt efficacy at 1W, 25°C, in a package that at 2.45 mm2 is 50% smaller. Read More...

200 lm/W efficiency barrier smashed

LUXEON LEDs enable highly efficient color mixing by providing a convenient above-blackbody color point with optimal standalone efficiency of 200 lm/W at 350 mA and 85°C. Read More...

CXA HD LED arrays deal unmatched lumen density

Cree just came out with three new LED arrays that they say will unlock new LED lighting applications. Read More...

Sub-miniature connector provides LED app flexibility

The AUH Series wire-to-board, crimp style, dis-connectable connectors by JST Corporation, provide a subminiature size, design flexibility, and reliable contact construction for high density applications. Read More...

LED Troffer ZR Series at $100 plus 200 LPW LED demo

The ZR Series LED troffers by Cree delivers superior color quality at greater than 90 CRI, an ultra slim, package, rapid installation, and a price tag of $99. Read More...

High-voltage, low-current LEDs are 45% brighter

The newest addition to the TitanBrite family of high-power LEDs, the TitanBrite High-Voltage, Low-Current LED by Lumex provides 45% brighter output and a 20% cost and 50% real estate savings. Read More...

High-bay LED luminaire--more lumens per dollar at half the energy

The CXB High-Bay LED luminaire by Cree delivers 23,000 lumens for commercial and industrial applications. Read More...

>> SEE ALL

What's inside the Samsung 40W-replacement-LED light?

What's inside the Samsung 40W-replacement-LED light? Read More...

Remote phosphor expands reach of LED light

This Prying Eyes explores how an LED bulb is able to project light in an almost 360-degree pattern. Read More...

Visionaire Lighting’s Solar Vision Pole: shedding light on off-grid lampposts

Certain applications justify paying a premium for high efficiency, long life, ruggedness, and light-color-temperature control, and these applications represent the sweet spot for HB LEDs (high-brightness light-emitting diodes). Read More...

Compact fluorescent lights: Not always the best solution

Prying Eyes: A look inside a CFL bulb helps explain why they're no good in downward-facing installations. Read More...

Way, way off the grid: Powering the Phoenix Mars lander

Prying Eyes: An inside look at the power-generation, -regulation, and -delivery system for the Phoenix Mars lander. Read More...

LED lighting teardowns: Five lighting designs that illuminate the future of lighting

Early SSL products are making their way onto store shelves and into inventory. These products can indicate what direction SSL design will take, at least in its early stages. Read More...

Tear-down: inside a 7W LED light bulb

A 5000K version of a 7W LED bulb served as the sacrificial lamb to see what's inside. Read More...

LED bulbs reveal different design approaches

A peek into the Philips LED bulb’s electronics and the 6W, dimmable Pharox 300 contrasts two approaches in how a bulb handles the protection of the LED-power-control electronics. Read More...

>> SEE ALL

DOE challenges lighting engineers with PAR38 competition

Here’s a competition launched by the U.S. Department of Energy (DOE) to spur lighting manufacturers to develop super high-quality, high-efficiency LED replacements for two of the most commonly used bulbs. What are you waiting for? Read More...

Using MCUs in Cell Phone and Tablet Apps

This article discusses the role of MCUs and programmable system-on-chip (PSoC) devices in cell phone and tablet applications. It also evaluates the system limitations and design challenges for these applications. Read More...

Planes, trains and LEDs

The unique properties of LEDs offer many advantages throughout the transportation sector. Their benefits go beyond cost, long life and maintenance. Read More...

Tips & Trends: Solving LED Droop

To date, using quantum wells used in high-power lighting apps suffer a significant loss of efficiency even at low electric currents. As current increases, efficiency suffers (droops) more. Read More...

LEDs and Cars—Highlights of Detroit and Vegas

Just a few years ago, LEDs were a differentiator for cars that had them. Now they’re a differentiator in how cars use them. There are several examples of what was shown at the Detroit Auto Show (aka North American International Auto Show) and CES in January. Read More...

Optimize power for user interfaces through wake-on-approach using capacitive proximity sensing--Part 3

Here’s a look at the types of proximity sensor hardware designs, and the challenges faced when designing them. Read More...

Implement capacitive proximity sensing in automotive applications

In this article, we will look at how capacitive proximity sensing is implemented, its benefits, and how the different characteristics of capacitive proximity sensing make it appropriate for automotive applications. Read More...

Optimize power for user interfaces through wake-on-approach using capacitive proximity sensing—Part 2

This segment covers the basics of proximity sensors and hardware implementation details of wake-on-approach proximity sensors. Read More...

Tips & Trends: Tackle LED compatibility

Compatibility is the number one compelling problem facing the entire LED industry today. No end-user or designer will–or should—care what promises and potential LED technology holds in the future, if it doesn’t meet their needs in the present. Read More...

Optimize power for user interfaces through wake-on-approach with capacitive proximity sensing--Part I

Backlight LEDs have special effects such as LED fading and breathing effects. In portable devices, LED effects consume more power and hence the battery-operated devices cannot afford to always drive effects on LEDs. With proximity sensing, only when the user starts using the device do the LEDs light up with special effects. Here’s a three-part series on power optimization. Read More...

The Top Ten LED Favorites of 2013

Whether it was an article, design idea, or blog—what did you appreciate on the LED Design Center site enough to come in droves to read it? Here you go—the top pieces for 2013. Read More...

LED Tips & Trends: Ledotron

With the advent of LED, new possibilities require new technology. OSRAM, in cooperation with Europe’s largest dimmer maker, INSTA GmbH developed the new Ledotron dimmer technology. Read More...

Overcome the challenges of driving parallel LED strings

Driving a large number of LEDs with a constant current can be done with either a lengthy series connection or by driving multiple strings in parallel. Today’s trend is operating strings in parallel, and this article explores options and the rational for implementing circuitry to achieve this goal. Read More...

LED Drivers—Match architectures with applications

Several basic architectural options available to designers. By understanding and comparing the strengths and weaknesses of each, it is possible to select the best driver solution for the application at hand. Read More...

Tips & Tricks: Keep pace with LED advances using reference designs

Reference designs are definitely a growing trend helping to evolve the quality of the LED marketplace and adoption. Don’t miss the opportunity to experience advances in this more painless way. Read More...

True or false? High-power LEDs don’t generate IR heat in the forward direction like a filament lamp

Is it true that a high power LED emits no UV or IR and that any heat is created only in the PN junction and then transferred to a heat sink? Read More...

>> SEE ALL

04.16.2014

DOE challenges lighting engineers with PAR38 competition

Here’s a competition launched by the U.S. Department of Energy (DOE) to spur lighting manufacturers to develop super high-quality, high-efficiency Read more...

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