Am 09.05.2016 um 14:57 schrieb scott:

> Needless to say, LEDs come in all sizes, but a rough rule of thumb is
> that they convert about 10% of the electrical power used into visible
> light (the other 90% going to heat). Which makes them "low power",
> compared to an equivalent "old" style bulb with the same light output.

With single-wavelength indicator LEDs as in the example, the efficiency
can be a good deal higher (typically about 40% for red LEDs, if
Wikipedia can be trusted on this one).

Still, even indicator LEDs need to be able to compete at least with
indirect daylinght on a sunny day, which is a *shitload* of lumen.

Which is why under many lighting conditions /anything/ employing
reflection -- whether it is reflective LCDs or e-ink -- is more
efficient than even the best LEDs.

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