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LEDs

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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.
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Lighten UP! Audi showcases LEDs

It seems fair. If I’m going to show LED commercials with melting rabbits, I should also highlight a zoomy one--Audi Showcasing LED technology in a new 16-second commercial. Read More...

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UV-A LED panel flood lamps for NDT inspection

The PowerMax 365 Series UV-A LED flood lamps can be installed overhead or in-line and connected for wide-area coverage. Read More...

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LED power supply features programmable LED dimming

A compact, high-efficiency DC/DC converter for hand-held LED devices by Bear Power Supplies incorporates a microprocessor for programming LED dimming. Read More...

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Intelligent LEDs will dramatically improve nighttime driving

I don’t know about you, but each year, prescription glasses or not, driving at night is increasingly difficult. There’s a Federal Ministry of Education and Research (FMER) research project underway designed to make driving at night much safer. Read More...

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Today’s LEDs—What’s responsible for the improvements?

Key developments in LED manufacturing including enhanced equipment, improved processes and superior materials, have allowed the latest generation of LEDs to provide a powerful combination of excellent light output, visual performance and space savings. Read More...

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Mechanical Buttons to capacitive sensing—A step-by-step guide—Part III

In Part 3 of this 4-part series, we’ll explore how to overcome the challenges faced in migrating from mechanical buttons to capacitive sensing buttons, what a mechanical button replacement (MBR) device is, and the problems and value add associated with MBR devices. Read More...

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LED Week in Review—Collaboration, shipments to hit 1.3 billion, winners, and more…

Here's a recap of recent happenings, from research discussing growth and consolidation to Edison Award winners, with other industry news thrown in for good measure. Read More...

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GaN LED on silicon plus light extraction yields cost-effective lighting

The issue with silicon is that it is mismatched severely both mechanically and thermally from GaN, resulting in severely bowed wafer growth and poor quality crystalline material from which to construct an LED device. Here's the solution. Read More...

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LEDs will never be seen here

That doesn’t mean they don’t exist. GE Commercial Lighting claims, in a recent press release, that there’s a dramatic transformation involving commercial lighting and design. LEDs, they claim, have found their way into places where they’ll never be seen by customers. Read More...

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Lighten Up! A eulogy for incandescent bulbs and California cows—What’s your favorite commercial?

I have to hand it to Cree. In my last newsletter I featured the season appropriate melting (or not melting) bunny video by Cree. I really don’t like to repurpose company ads, but well, they are really doing an incredible job. Read More...

>> SEE ALL
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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...

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An improved offline driver lights an LED string

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

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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...

LED-current limiter accepts ac or dc

Prevent excessive current from overdriving your LEDs. Read More...

Protect power-LED strings from overcurrent

Add diodes and a transistor to a current mirror to prevent LED damage. Read More...

>> SEE ALL
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UV-A LED panel flood lamps for NDT inspection

The PowerMax 365 Series UV-A LED flood lamps can be installed overhead or in-line and connected for wide-area coverage. Read More...

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LED power supply features programmable LED dimming

A compact, high-efficiency DC/DC converter for hand-held LED devices by Bear Power Supplies incorporates a microprocessor for programming LED dimming. Read More...

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Connectors up performance for LED bulbs and fixtures

Several wire-to-board and board-to-board connectors from Hirose are part of the DF Series (DF57H, DF59, DF61 and DF62) that offers space savings, high cable pull forces, and reliability. Read More...

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DC/DC LED drivers simplify white color tuning

Three DC/DC LED drivers by Texas Instruments are designed to simplify white color tuning for high-color rendering and ultra-low dimming in indoor/outdoor apps. Read More...

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AIS open frame monitors feature LCD touch screen interface

Targeting industrial OEMs, equipment, machinery and kiosk manufacturers, as well as automation control and process systems, American Industrial Systems (AIS) unveiled open frame LCD monitors to help simplify all aspects of machine-to-machine interface applications. Read More...

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Chip on board (COB) LED design with thermal platform

The LED supply side has a great many good LED offerings. The technology is progressing very quickly and most suppliers are following the innovative trends of lumens/watt, lumens/$, lumens/area, efficacy, correlated color temperature (CCT) options available, color rendering index (CRI) options and following the standard deviation of color matching (3SDCM) standards, which is color consistency between sources. Read More...

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Powerful IRED LED with tight focusing and external optics

The Oslon black SFH 4716S by Osram is an infrared LED with a wide beam angle. With an optical output of 1030 milliwatts and a beam angle of 150 degrees, it is one of the most powerful IREDs available. Read More...

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Stage LEDs feature million 48 candelas/sq. meter

Ostar Stage LEDs from Osram Opto Semiconductors provide high luminance of 48 million candelas per square meter and tunable color tones from cold white to warm white. Read More...

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2W UV LED delivers 70% energy, 90% space savings

The TitanBrite 2W UV LED by Lumex consumes 50% and 70% less energy than CCFLs and UV filament lamps, respectively. Read More...

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LED driver IC targets space-constrained apps

The C3183 by CamSemi is a low cost and flexible LED driver IC for low cost, energy efficient A-series, GU 10 and other space-constrained LED lamps. Read More...

>> SEE ALL
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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
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Today’s LEDs—What’s responsible for the improvements?

Key developments in LED manufacturing including enhanced equipment, improved processes and superior materials, have allowed the latest generation of LEDs to provide a powerful combination of excellent light output, visual performance and space savings. Read More...

image

GaN LED on silicon plus light extraction yields cost-effective lighting

The issue with silicon is that it is mismatched severely both mechanically and thermally from GaN, resulting in severely bowed wafer growth and poor quality crystalline material from which to construct an LED device. Here's the solution. Read More...

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Testing a power supply – Stability (Part three)

This is the third and final part in a three-part series which discusses how to properly test a power supply to ensure it will work reliably over various operating conditions. The series is intended to provide the design engineer with a sufficient understanding about some, but not necessarily all, of the testing needed to verify a reliable power supply design. Read More...

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Minimize LED backlight power consumption in handheld devices with proximity sensing

An efficient way to reduce power consumption is to control the backlight LEDs whenever the user needs to operate the appliance. If the backlight LEDs are on continuously, it can become annoying and a distraction for the consumer. Read More...

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Ensure long lifetimes from electrolytic capacitors: A case study in LED light bulbs

Several years ago I worked on a few designs for LED light bulbs. Very early on it became clear that the temperatures of components in such light bulbs can get quite high. Read More...

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LED research and where’s the money?

Here are recaps of LED-based research reports--valuable tools that are particularly helpful in making sense of such a dynamic industry segment. Me, in the short term, I follow the money. Read More...

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Super Bowl XLVII blackout: Power redundancy, paralleling and LED lighting

The power was cut off to half the Mercedes-Benz Superdome early in the third quarter of the big game between the Baltimore Ravens and San Francisco 49ers, causing a 34-minute delay back in February. Read More...

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Three things they should have taught in Engineering 101, Part 3: Learn an intuitive approach

Part three of an excerpt from the book "Electrical Engineering 101, Third Edition" discusses how to develop the skill of intuitive signal analysis. Read More...

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Get more operating life from LED-based bulbs

LED bulbs promise a long life, but how can they be squeezed to offer even more in operating life expectancy? Read on. Read More...

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Bay Lights--San Francisco Bay Bridge gets an LED facelift

The Golden Gate Bridge in San Francisco is a sight to behold. It has a unique color, shape, and it spans such lovely territory, well it’s just plain awesome. Now, however, it has major competition from the San Francisco Bay Bridge. Read More...

>> SEE ALL
04.30.2013

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...

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04.30.2013
Pocket white-LED torch is power efficient
EDUCATION
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  • 12.10.2012
    • ·
  • 1 Comment(s)
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