LED Luminaries

LED news and insight from our technology editor Steve Bush, who has been messing with LED lighting for more years than he would care to remember.

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Graphene LEDs

The University of Manchester has made LEDs using a quantum well heterostructure made from 2d materials including graphene, boron nitride, and molybdenum disulphide.

Efficiency isn’t far behind OLEDs.

For more, scroll to the bottom of this graphene led story on the main Electronics Weekly website…

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For very fat leds, a 20A (40A peak) driver chip - and it's agile

For very fat leds, a 20A (40A peak) driver chip - and it's agile

  Linear Tech’s LT3744 synchronous buck converter is designed to deliver 20A constantly from 12V, or 40A pulsed – this is 80 or 160W according to the company, so it is assuming 4V Vf.

As it is intended for use in projectors, the design allows quick transitions between output current levels…

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Philips gets excited about Lumileds merger

Philips gets excited about Lumileds merger

Philips is really keen that everyone should know that it is combining its automotive and led (Lumileds) businesses, and it looks like it is happening on the 1st of April.

This should be interesting because, after a great start, Lumileds appeared to take its eye of LED headlights, leaving Osram…

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EU 3d led project gets institutionalised

EU 3d led project gets institutionalised

Out of the European Union GECCO project to grow bristle-like light emitting nanowires, to form ’3d nano-leds’, has come an organisation to continue the work.

Called Epitaxy Competence Centre (ec2), it is a joint venture between Osram Opto Semiconductors and the Institute of Semiconductor Technology (floors 8-10…

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April showers.. ... accompany LED workshops

In April, Microchip, Osram Opto, and Osram ‘LED Light for You’ partners have teamed up to hold workshops on leds ad led drivers.

The dates are:
14th April Manchester
16th April Reading

“These LED workshops offer developers and manufacturers the chance to brush up on the latest trends and innovations…

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Bridgelux waves good-by to CRI

Bridgelux waves good-by to CRI

For its Vero Decor range of lighting CoB leds, Bridgelux has ditched the traditional CRI measure of white quality and gone for ‘gamut area index’ (GAI), claiming the Décor Class A products are the first commercially available LED arrays on the market to meet the full Class A Colour…

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Lumileds' automotive front-lighting LED

Lumileds' automotive front-lighting LED

Lumileds has revealed more details of its Luxeon F automotive forward lighting led.

Announced more than a year ago, it is a small (1.9×2.3mm) lens-less surface-mount single-die ceramic-tile device. Now an application brief, product brief and data sheet have appeared.

“Luxeon F is hot…

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Cree LR22

Cree LR22

Cree’s LR22 troffer is a fully luminous, diffused fixture aimed at offices, healthcare facilities and schools in Europe (220-240V).

It is 595 x 595mm, comes in 3,000 and 4,000K white, and eficacy is up to 95 lm/W.

Control is DALI or 1-10V with two…

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Osram celebrates International Year of Light

Osram celebrates International Year of Light

  To celebrate the International Year of Light, Osram illuminated the facade of the Deutsches Museum in Munich.

The installation is called “Light is more than illumination…

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An LED for torches

An LED for torches

Cree’s XQ-E Torch is optimised for portable-lighting applications

It is rated at a higher maximum current than the XQ-E and XP-C LEDs, and has simplified colour binning – it is only available in cool white.

Lumen output is 20% the XP-C LED in a package…

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Osram LEDs approach theoretical Vf limit

Osram LEDs approach theoretical Vf limit

According to Osram Opto, its blue die are approaching the theoretical limit for forward voltage.

Having shaved 20mV off from production leds last summer “In the laboratory we have already succeeded in further reducing the forward voltage by as much as 30mV”, said Osram scientist Dr Joachim Hertkorn. “Any further…

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High CRI GU10 found in UK High Street

High CRI GU10 found in UK High Street

It transpires that Scandi household* store Clas Ohlson has >90CRI led GU10 bulbs amongst its standard 80CRI offerings.

This is the one I saw (right).

The detailed spec on the website says 90CRI and 300 lm, but I think the box says 92 or even 95CRI and 345 lm…

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