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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Fairchild replaces mains LED driver after four months

Fairchild replaces mains LED driver after four months

For reasons I cannot yet fathom from the data sheets, Fairchild has replaced the FL7733 mains led driver chip (July 2014) – at least, it is not recommended for new designs – with the FL7733A.

FL7733A is a 5-60W single-stage led driver with primary-side control with <10% THD…

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Verbatim'sPAR16 GU10

Verbatim'sPAR16 GU10

Verbatim’s dimmable 8.5W PAR16 GU10 range delivers up to 660lmm and comes in a choice of colour temperatures, and are 25% more efficient than the firm’s previous generation.

The firm is being good here – quoting 660 lm in a 90° cone. Total output is up to 690…

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Merc adaptive headlight has Osram leds

The Mercedes Benz CLS has adaptive front lighting (AFS) using Osram Oslon Compact LEDs.

Each module in the headlight is equipped with 24 leds packed close together – each is 1.6×1.2mm.

“They are extremely compact, so they can be arranged close to one another in the headlight with a…

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Luminus 1W led under 2x2mm

Luminus 1W led under 2x2mm

Luminus Devices has announced Cube, a 1W lighting LED in a 1.9×1.9mm package.

Designed from scratch for lighting rather than backlighting, it has a 170 degree viewing angle.

Efficacy is up to 143 lm/W, max power is 1.63W, and colour temperature spans 2,700-5,000K…

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Lumileds adds 6.5mm CoBs for spots

Lumileds adds 6.5mm CoBs for spots

For spotlights and directional lamps, Lumileds has added a 6.5mm emissive diameter lighting led to its range of CoBs.

Called Luxeon CoB 1202, firm claims it can deliver 65,000 candelas at a 10 ̊ beam angle – without clarifying if this is +/-5 or +/-10 ̊ – and sees it used in…

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LED thermal test in 300ms

Thermal testing of LEDs on a production line need only take 300ms, claim’s Taiwan’s Industrial Technology Research Institute (ITRI).

Its technique is called ICTA – In-line compact thermal analyser technology. “ICTA employs in-line thermal resistance testing with a rate of 12,000 LED units per hour,” said…

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Heat tape offers 0.8W/mK

Heat tape offers 0.8W/mK

Bond-Ply 800 from Bergquist takes thermal conductivity to 0.8W/mK, and cures at room temperature.

The double-sided tape is intended for attaching heat spreaders or heatsinks to assemblies like LED light engines, motor controllers, power converters, or high-performance processors.

It has a fibreglass carrier and acrylic…

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Blood and pulse monitor chip has 3 LEDs plus photodiode

Blood and pulse monitor chip has 3 LEDs plus photodiode

For fitness devices, Osram has combined three different colour LEDs and a photodiode in a single 4.7×2.5×0.9mm package for reflective blood oxygen and pulse sensing.

Leds in the SFH 7050 are 530nm (green), 660nm (red) and 940nm (infra-red), the photodiode active surface is 1.3×1.3mm…

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Single LED headlamp low-beam

Single LED headlamp low-beam

Osram has made a single die car headlight dip-beam, in the lab.

It relied on a super-intensity die – see more on the Electronics Weekly news website.

Speculating a bit, I am guessing the die is 1mm or less front to back, and 1mm or more side to side…

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Art studio lighting conundrum

Art studio lighting conundrum

I have a friend who teaches Chinese brush painting.

She is rather good, and she is having the garage converted into a studio for teaching.

And she wants LED lighting.

However, all the easily available light bulbs are not exactly brilliant for colour rendering.

The led makers make suitable emitters…

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IBM builds blue LEDs on graphene

IBM builds blue LEDs on graphene

IBM has shown graphene can be used as a non-stick layer between silicon carbide wafers and epitaxial GaN – allowing the expensive SiC wafer to be used multiple times.

The graphene layer (which it self is epitaxially grown) stays with the SiC – like teflon on frying pan – so the wafer…

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Lumileds adds mid-power arrays and strips

Lumileds adds mid-power arrays and strips

Lumileds has added rigid large-area (55x280mm) arrays and flexible lighting strips to its portfolio – based around 3535 mid-power LEDs.

There is more information on the main Electronics Weekly website…

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