Tech news tagged ‘LED’

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

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

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 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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Osram achives IR LED high

Osram has pushed up the power of its 850nm Oslon Black leds, upping output to 800mW from 630mW in the ‘A’ suffix version of its SFH 4715.

This is a 90° led intended for security illumination. For feeding narrow-beam reflector optics, there is also a 150° SFH 4716A.

For…

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LEDs take over Frankfurt

Last week I attended the Light + Building trade show in Frankfurt and found myself thinking that it should be renamed the LED + Building show. LEDs were everywhere. It was actually a struggle to find a stand without LED products at the show, although in many cases they’d been simply…

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What’s the big deal with LED traffic lights?

Someone asked me this the other day, so I’ll share my answer as it involves some pretty impressive figures. London has over 5000 traffic intersections, each one comprising an average of 10 traffic signals, making  about 50,000 signals. If those were to be converted to LED lights, the…

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