Led Luminaries

If optic diameter is important, forming letter-box beams is such a struggle, that the likes of Lumileds, Cree and Osram should make some nice rectangular die. Only my opinion of course, fuelled by my attempts to make anti-dazzle bicycle lights, but I am sure designers of wall-washers and other fan-beam luminaires would soon make used of them. Osram and Lumileds ...

Osram has introduced a range of leds for feeding light guides in automotive external lighting. All the packages have the same 2.7 x 2.0 x 0.6mm external characteristics, despite the range of die colours and die sizes available. Called Synios P 2720, the family is aimed at daytime running lights, position lights, and tail light clusters. Die are either 500µm, ...

Osram has increased the output of its Oslon Black 850nm  infra-red LEDs for the second time in six months. Aimed at security camera illumination, SFH 4715AS can deliver 1.34W of IR at 1A (at 3.2Vtyp) with a +/-45° beam angle. The package remains 3.85 x 3.85mm, and 2.29mm high with a thermal resistance of 9K/Wmax. There is also a +/-75° ...

Ohio-based Global Lighting Technologies (GLT) intends to compete with OLED lighting using thin light guides – 2mm over much of the area and 3.5 at the edges of the 100x100mm version it is exhibiting at Lightfair. For slightly more information, see the GLT on the Electronics Weekly news website. a . I am dying to see how light is coupled in without fiddly ...

 Cree has introduced LMH2+, a higher efficacy version of its LMH2 light engine. Because the modules include both white (blue die amber phosphor) and red leds, 125 lm/W and 90 CRI are available together. “The LMH2+ is a drop-in upgrade for LMH2-based designs,” said Cree – which is not completely true, as ‘+’ versions only come in 90 CRI ‘whitelight ...

The German Government is supporting an attempt to cut cost from led luminaires by integrating manufacturing from epitaxy to finished product. See the Electronics Weekly news site for more.

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.

  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 (see below) – and includes the facility to store ...

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 in the lead – so expect demonstrations of prowess. To ...

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 in picture) and the Technical University of Braunschweig. The aim of the ec² ...