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[APD] LEDs once more

The BBC yesterday had a very interesting radio program about LEDs on 
Material World.

You can listen to it via a podcast


I for one didn't know that so called white LEDs are really blue with a 
yellowing phosphorus that only looks white(ish) due to the workings of the 
human eye.

Well so much for trying to grow plants with these then!

Stuart Halliday
200 Million years in the making...
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