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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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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Cree ups power in mid-power competitor

Cree ups power in mid-power competitor

Having invented its lens-less 5x5mm MHB-A as a competitor to mid-power leds when a bit more of a beam is required, it has now extended the idea to a 7x7mm format.

MHD-E and MHD-G deliver 1,800 lm at 14W and 2,500 lm at…

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Surface-mount mains push-in connector

Surface-mount mains push-in connector

German firm Wago has in interesting surface-mount ‘push-in’ connector for lighting.

It does both mains-to-board and baord-to-board.

There is a bit more on the Electronics Weekly news website, and there is a link there to a data sheet for the range…

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Deep UV AlGaN leds

Deep UV AlGaN leds

Just in case you need a deep UV led, Nikkiso of Japan is gearing up for mass production of AlGaN leds for wavelengths spanning 255-350nm.

The firm used the services of, now, Nobel prize winning professors Isamu Akasaki and Hiroshi Amano, and Meijo University.

“AlGaN is much more difficult…

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Osram starts to bridge green gap

Osram starts to bridge green gap

Slightly old story here – but most interesting.

High-efficiency green leds have come out of Hi-Q-LED, a German federally*-funded project co-ordinated by Osram Opto Semi.

The ‘green gap’ is a spectral region for which it is difficult to make efficient leds (see graph).

From Hi-Q…

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Further update: MR16 and PAR16 have dichroic glittery look

Further update: MR16 and PAR16 have dichroic glittery look

For minimalist luminaires where the sides of MR16 or PAR16 bulbs are intended to be seen, Verbatim is making MR16 (GU5.3 base) or PAR16 (GU10) “dichroic-effect” LED lamps.

Verbatim has kindly clarified some points below – thanks folks

Dichroic reflectors used to be used in incandescent MR16s and similar…

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RGB lighting shield for Arduino prototyping

RGB lighting shield for Arduino prototyping

For prototyping, Infineon has a RGB LED lighting control shield for Arduino, based around its ARM Cortex-M0 XMC1202 microcontroller.

On board is something called a ‘brightness colour control unit’ which “ensures smooth, eye-friendly diming and colour mixing for different topologies in an expandable design, with DALI/DMX or…

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GU10 autopsy

GU10 autopsy

I cut and pulled apart a failed GU10 to see what had gone wrong.

The guy who gave it to me said he installed 20 or so not long ago, and already a few have stopped working.

Heatsinking it pitiful – there is a single pcb with 27 leds on one…

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