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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.

Special Digital Edition: LED Design

This special Digital Edition is a collection of must-read pieces which cover a wide gamut of LED lighting design topics, including off-line drivers, international agency standards, power supply topologies, dimming, PFC, and reliability engineering. Designing with LEDs? Start here. Sponsored by On Semiconductor Read More...

Making the Smart Hat: Part 1

The maker of this LED-encrusted Wi-Fi-enabled Smart Hat shares his DIY, how-to designs. Read More...

Free PCB design tool includes 3D modeling, crowd-sourced parts database

CircuitMaker PCB design tools' 3D modeling and other features will help designers deal with the "lumpy" nature of LED lighting products or other design projects involving large, irregular components. But that's only half of the story. Read More...

Get SMU test results from an Android device

The IVy Android app from Keithley lets you set up tests and get data without programming. Read More...

3D printed optics for outdoor and indoor LED lighting designs

LUXeXceL's high-resolution 3D printing process avoids the optical flaws created by the individual layers filament-based machines produce. Instead, they use something similar to an ink jet printer which deposits micro drops of a photopolymer onto a substrate material and hardens them with UV light. Read More...

Hackspotter: World's most dangerous LED display caught at Maker Faire

Stay clear of the whirling sphere please, this is not a toy! Weighing in at over 350 lbs, the Orbital Rendersphere is a whirling LED array which uses the persistence of vision effect to paint 360 degree images in thin air. Read More...

Photodiodes and other Light Sensors, Part 2

In this section we shall discuss the interface between a photosensor and its associated electronics. There are really just two photocell applications – light measurement, and the reception of modulated light. Read More...

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...

Semi-Coherent Emissions: October 15, 2014

Can LEDs conquer the Monday morning blues? What's with those "AC LEDs" that Samsung's recently Announced? And What's GE hiding inside its GE Link Smartbulb? You'll find the answers to these pressing questions a second opinion on the so-called "rebound Effect" and a toast to the Nobel Laureates who invented the blue LED In this week's Semi-Coherent blog. Read More...

A guide to selecting power supplies for LED lighting applications

In order for your solid-state lighting design to realize its full efficiency, durability, and longevity, you'll need to choose a power supply with characteristics that closely match the requirements of your application and the LEDs you're using. Read More...

High-temp-high-power LEDs may enable lower solution costs for lamps & light engines

Cree's XLamp MH-B LED series reflects an interesting strategy for helping manufacturers control their total component costs without having to slash too deeply into Cree's part of the BOM. Besides making it easy for manufacturers to cut assembly costs by moving from large arrays of mid-power LEDs to fewer, higher-powered LEDs, Cree says that their MH-B devices' higher operating temperatures enable designers to use smaller, lighter heat sinks which dramatically reduce product's total BOM cost. Read More...

Readers were the Rock Stars at NY Maker Faire 2014

We've always known EDN's readers were a pretty interesting lot. But we didn't know how interesting they were until a bunch of them joined us for a "backstage pass" style tour of some of the exhibits at the NY Maker Faire. Read More...

Meet EDN + EE Times editors for a "backstage tour" at Maker Faire

Join Suzanne Defree, Lee Goldberg and some of your other favorite EDN celebrities for a reader/editor meetup at Maker Faire on Saturday, September 20 at 12 noon. We'll have snacks, swag and surprises for you as well as "backstage pass"-style tour of the exhibits at the Atmel and Texas Instruments booths. 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

Free PCB design tool includes 3D modeling, crowd-sourced parts database

CircuitMaker PCB design tools' 3D modeling and other features will help designers deal with the "lumpy" nature of LED lighting products or other design projects involving large, irregular components. But that's only half of the story. Read More...

Get SMU test results from an Android device

The IVy Android app from Keithley lets you set up tests and get data without programming. Read More...

3D printed optics for outdoor and indoor LED lighting designs

LUXeXceL's high-resolution 3D printing process avoids the optical flaws created by the individual layers filament-based machines produce. Instead, they use something similar to an ink jet printer which deposits micro drops of a photopolymer onto a substrate material and hardens them with UV light. 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...

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...

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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

Making the Smart Hat: Part 1

The maker of this LED-encrusted Wi-Fi-enabled Smart Hat shares his DIY, how-to designs. Read More...

A guide to selecting power supplies for LED lighting applications

In order for your solid-state lighting design to realize its full efficiency, durability, and longevity, you'll need to choose a power supply with characteristics that closely match the requirements of your application and the LEDs you're using. 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...

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...

>> SEE ALL

Making the Smart Hat: Part 1

The maker of this LED-encrusted Wi-Fi-enabled Smart Hat shares his DIY, how-to designs. Read More...

Semi-Coherent Emissions: October 15, 2014

Can LEDs conquer the Monday morning blues? What's with those "AC LEDs" that Samsung's recently Announced? And What's GE hiding inside its GE Link Smartbulb? You'll find the answers to these pressing questions a second opinion on the so-called "rebound Effect" and a toast to the Nobel Laureates who invented the blue LED In this week's Semi-Coherent blog. Read More...

Hackspotter: World's most dangerous LED display caught at Maker Faire

Stay clear of the whirling sphere please, this is not a toy! Weighing in at over 350 lbs, the Orbital Rendersphere is a whirling LED array which uses the persistence of vision effect to paint 360 degree images in thin air. Read More...

First graphene-based flexible display is unveiled

For the first time graphene has been used in a transistor-based flexible device which promises to open opportunities to enabling fully wearable and flexible devices. 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...

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...

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