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LEDs

Lee Goldberg
Principal
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.

Photodiodes and other Light Sensors, Part 1

This article has been written to answer a number of questions that the author has encountered, as an analog applications engineer, concerning the characteristics of photosensors and photosensor interface circuitry – both for AC and DC applications. Read More...

How-to design LED signage and LED matrix displays (Part 2)

In Part 2 of this 3-part series, we'll look at the remaining steps necessary to complete a basic LED display driver system. This will lay the groundwork for Part 3 which will introduce several important features becoming commonly available on advanced LED display driver ICs, as well as tips on how to make best use of them. Read More...

LED lighting design sites offer tips, tools and techniques to speed design

ON Semiconductors has launched a pair of web sites which put you one click away from a bunch of resources which could be valuable for your next LED lighting design. They've mined a lot of their deep expertise in power and analog, and applied it directly to LED-related issues in the form of design notes, app notes, white papers and videos. Read More...

What you should know about HBLEDs - and nobody will tell you, part 3

In this concluding installment, Ed introduces some of the basic considerations involved with selecting the right optics and power supply for your design. Ed wraps up the lesson with a "Top 10" list of LED design issues and an insider’s guide to the most important LED tech issues to watch in 2014. Read More...

Heave your heat sinks with Bergquist's "Thermal Management for LEDs" guide

One of the ugly truths of the SSL industry is that conventional heat sinks often account for a shockingly high percentage of many LED products' BOM and assembly costs. That's why I was so intrigued when I stumbled on a copy of Bergquist's solutions guide for using their T-Clad thermal substrates in LED designs Read More...

Integrated display power and LED driver IC for Smartphones

What designer could say no to a device which saves them precious board space while adding much-needed slack to their power budget? And the hybrid dimming capability is icing on the cake. Read More...

IR LED achieves 48% electro-optic efficiency

Intended for security illumination, the Oslon Black SFH 4715A infrared LED from Osram Opto Semiconductors offers a typical electro-optic efficiency of 48%, as well as a 90° beam angle and a 30% increase in output power over its predecessor, the SFH 4715. Read More...

Track and recessed LED luminaires offer adjustable benefits

Intense Lighting Inc. has released the MX family of LED recessed multiples and track luminaires which provide adjustability, high performance and efficiency suited for accent and spot lighting applications such as retail, museums and galleries. Read More...

LED-fitted passive RF-field detector tag offers visual feedback

Equipped with a bright LED, whenever Farsens' Photon RFID tag comes close to an RF field source, it harvests energy from the RF field and drives its LED according to the field’s strength. Read More...

Color sensor tunes LED light color through smartphone interface

Through the use of its True Color sensor, MAZeT GmbH has demonstrated the accurate colour control of LEDs using a smartphone or tablet as a remote control. Read More...

1st electric traffic light system installed, August 5, 1914

On this day in tech history, the first electric traffic light system, which used red and green lights with a buzzer and was connected to emergency services, was installed in Cleveland, OH. Read More...

Semi-Coherent Emissions: LEDucation forum, White LED wars, Display color temp adjuster & more

LEDitor lusts for world's tackiest LED device, Little Data & smart lighting , download a human-centric lighting demo and LEDucation wants you! – all this and more in LEDitor-in-Chief Lee Goldberg's latest non-random sampling of the premier products, trending technologies, gossip and goings-on within the solid-state lighting universe. Read More...

A Dennis-centric reality check on Human-Centric Lighting

Human-Centric Lighting (HCL) is an exciting frontier which has the potential to improve nearly everyone's health and quality of life. Unfortunately, a lot the folks offering "HCL-ish" LED products have a limited, or nonexistent grasp of the basic tenets of human centric lighting. But rather than wring our hands at the natural tendency of some companies to exploit the sudden popularity of a market trend (gluten-free LEDs anyone?) without delivering its true benefits, let’s get out in front of those posers by taking the time to really understand what all this HCL stuff is really about. Read More...

How-to design LED signage and LED matrix displays (Part 1)

LED-based signage and matrix displays are bringing new dimensions of versatility and eye-pleasing visual effects to a growing number of outdoor and indoor applications. In this tutorial, Texas Instruments takes a detailed look at the essential technical principles of LED display systems and the engineering considerations required to design them using arrays of discrete LED lamps. Read More...

Semi-Coherent Emissions: LEDs with your meatballs? OLEDs everywhere, the World Cup of energy efficiency and the latest SSL canoodlings

OLEDs seem to be everywhere this week, from an important development accord with China's largest display maker to the upcoming OLED World Summit. And while we wait to see how America ranks in the World Cup of energy efficiency, there's time to check out the last installment of Ed Rodriguez' HBLED tutorial and Ron Amok's rampage against Ikea's low-cost LEd bulbs. Read More...

The Playbook

Is it inevitable that the American LED lighting industry will also follow the race to the bottom that’s hollowed out the American industries which gave birth to automobiles, TV, VCRs, computers, cell phones, and countless other tools which power the modern Global economy? Before you answer, you should read "Factory Man: How One Furniture Maker Battled Offshoring, Stayed Local - and Helped Save an American Town", by Beth Macy. Read More...

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HB-LED flashing beacon repurposes switching regulator

A classic, low-cost “switcher” IC is repurposed to flash a high-brightness LED in this minimal-parts-count Design Idea. Read More...

Two PIC pins drive six LEDs

Here’s a take on LED multiplexing with minimal output pins. Read More...

Failsafe multichip LED module driver

Keep a power LED module with multiple strings operating despite fault conditions. Read More...

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...

>> SEE ALL

Track and recessed LED luminaires offer adjustable benefits

Intense Lighting Inc. has released the MX family of LED recessed multiples and track luminaires which provide adjustability, high performance and efficiency suited for accent and spot lighting applications such as retail, museums and galleries. Read More...

LED-fitted passive RF-field detector tag offers visual feedback

Equipped with a bright LED, whenever Farsens' Photon RFID tag comes close to an RF field source, it harvests energy from the RF field and drives its LED according to the field’s strength. Read More...

Color sensor tunes LED light color through smartphone interface

Through the use of its True Color sensor, MAZeT GmbH has demonstrated the accurate colour control of LEDs using a smartphone or tablet as a remote control. Read More...

LED lighting design sites offer tips, tools and techniques to speed design

ON Semiconductors has launched a pair of web sites which put you one click away from a bunch of resources which could be valuable for your next LED lighting design. They've mined a lot of their deep expertise in power and analog, and applied it directly to LED-related issues in the form of design notes, app notes, white papers and videos. Read More...

Buck/boost converter drives dimmable LEDs

The AL8812 DC/DC converter from Diodes Inc. contains an internal temperature-compensated reference, comparator, controlled duty-cycle oscillator with an active current-limit circuit, driver, and high-current output switch for driving dimmable MR16 LED lamps. Read More...

LED light engines’ hybrid packaging helps cut cost of PAR & halide replacements with longer life, wider design options

Bridgelux’s V10 and V15 light engines should make a lot of lighting equipment designer’s jobs easier – and probably more fun. These compact, high-performance Chip-on-Board (COB) LED array light sources bring all the advantages of the higher-powered members of the V-series product family (introduced last September) to many mid-power applications. Read More...

LEDs offer almost natural sunlight colour spectrum

Kyocera Corporation has developed a new type of LED that produces a color spectrum close to natural sunlight which makes the device ideal for color-inspection applications. Read More...

LED system enables instant customization of PAR30, PAR38 and AR111 lamps

SORAA’s s SNAP System of rapidly-customizable LED lamps now includes several large lamp products and accessories which allow users to customize light directly on the lamp rather than on the fixture. Read More...

Isolated LED-Driver ICs Offer Higher Output & Efficiency, Greater Dimming Accuracy, Lower Component Count

LYTSwitch-2 family of isolated LED drivers from Power Integrations delivers up to 12 watts of accurately controlled output power while enabling simpler, smaller, more reliable and more cost-effective LED lighting designs. Read More...

Rectangular, low profile LED opens up design options

The Synios E4014 LED from Osram Opto Semiconductor features a rectangular and low profile shape so that, with the design, light is easily injected into light guides and uniformly distributed. Read More...

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...

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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

How-to design LED signage and LED matrix displays (Part 2)

In Part 2 of this 3-part series, we'll look at the remaining steps necessary to complete a basic LED display driver system. This will lay the groundwork for Part 3 which will introduce several important features becoming commonly available on advanced LED display driver ICs, as well as tips on how to make best use of them. Read More...

What you should know about HBLEDs - and nobody will tell you, part 3

In this concluding installment, Ed introduces some of the basic considerations involved with selecting the right optics and power supply for your design. Ed wraps up the lesson with a "Top 10" list of LED design issues and an insider’s guide to the most important LED tech issues to watch in 2014. Read More...

What you should know about HBLEDs - and nobody will tell you, part 1

Ed Rodriguez offers an up-close-and-personal look at some of the lesser-known physical principles and manufacturing technologies that make HBLED lighting possible – and some of the irksome issues manufacturers would prefer to ignore. Read More...

OLED microdisplays made simple

At this week's SID Display Week conference taking place in San Diego, Dr. Alexander Zakhidov presented COMEDD’s latest development for the manufacture of high resolution OLED microdisplays. Read More...

Living up to bright expectations

LED-savvy customers’ rising expectations for value, reliability, and light quality of mean new challenges for SSL industry. Read More...

Are your LEDs electrically overstressed? Part III

This article identifies the transient conditions that are benign to LED components and those that can induce electrical overstress (EOS) and catastrophic failure and suggests some ways to minimize the potential for EOS. Here is the final segment. Read More...

Are your LEDs electrically Overstressed? Part II

This article identifies the transient conditions that are benign to LED components and those that can induce electrical overstress (EOS) and catastrophic failure and suggests some ways to minimize the potential for EOS. Here is the second segment. Read More...

Are your LEDs electrically overstressed? Part I

This article identifies the transient conditions that are benign to LED components and those that can induce electrical overstress (EOS) and catastrophic failure and suggests some ways to minimize the potential for EOS. Read More...

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...

>> SEE ALL

What you should know about HBLEDs - and nobody will tell you, part 3

In this concluding installment, Ed introduces some of the basic considerations involved with selecting the right optics and power supply for your design. Ed wraps up the lesson with a "Top 10" list of LED design issues and an insider’s guide to the most important LED tech issues to watch in 2014. Read More...

LED conspiracy theory

AllLED Lighting’s recent discussion about a article posted June 23 on LED Insider about Philips Lumileds’ admonition to the industry to explore strategies for adding value and differentiating their products raises several interesting questions – none of which I’ve got an answer for. Read More...

Semi-Coherent Emissions: NFC makes Bluetooth smarter, LED-mania makes crowdfunding dumber, Philips denies patent trolling

Lee's latest non-random sampling of the premier products, trending technologies, gossip and goings-on within the solid-state lighting universe. Read More...

Comparing handheld spectrometers - what matters to SSL pros (like you)

"Whether you’re designing LED lights or using them, a handheld spectrometer is as essential to your trade as a pocket knife is to a boy/girl scout on a camp-out" says Dennis McCarthy, LED lighting technologist and EDN columnist. "Whatever your application, a spectrometer is a great antidote for the growing levels of snake oil in the LED industry. The cold, hard data these little wonders put in your hand are invaluable for separating the truth from installer’s or manufacturers’ claims.” Join Dennis for an insiders’ look at one of the tools of his trade. To help you decide which unit would best suit your needs, Dennis shares his thoughts on the three units he’s had the good fortune to play with personally during his adventures in the realm of lighting. Read More...

What you should know about HBLEDs - and nobody will tell you, part 1

Ed Rodriguez offers an up-close-and-personal look at some of the lesser-known physical principles and manufacturing technologies that make HBLED lighting possible – and some of the irksome issues manufacturers would prefer to ignore. Read More...

Semi-coherent emissions: 30 rules of lighting, UVLED 3D printer & lumen lust

The latest non-random sampling of premier products, trending technologies, gossip and goings-on within the solid-state lighting universe. Compiled, Curated and Commented by Lee H. Goldberg – Managing Editor, EDN’s LED Design Center. Read More...

LEDs tap indoor location technology for social shopping

The next generation of LED lighting fixtures that communicate with shoppers' smart devices while in-store, enabling retailers to provide new location-based services have been revealed by GE Lighting and ByteLight. Read More...

Heave your heat sinks with Bergquist's "Thermal Management for LEDs" guide

One of the ugly truths of the SSL industry is that conventional heat sinks often account for a shockingly high percentage of many LED products' BOM and assembly costs. That's why I was so intrigued when I stumbled on a copy of Bergquist's solutions guide for using their T-Clad thermal substrates in LED designs Read More...

Integrated display power and LED driver IC for Smartphones

What designer could say no to a device which saves them precious board space while adding much-needed slack to their power budget? And the hybrid dimming capability is icing on the cake. Read More...

How-to design LED signage and LED matrix displays (Part 2)

In Part 2 of this 3-part series, we'll look at the remaining steps necessary to complete a basic LED display driver system. This will lay the groundwork for Part 3 which will introduce several important features becoming commonly available on advanced LED display driver ICs, as well as tips on how to make best use of them. Read More...

>> SEE ALL

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