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Topic: I want (More than 100% effcient) some LED's! (Read 1 time) previous topic - next topic

cjdelphi

http://www.wired.co.uk/news/archive/2012-03/09/230-percent-efficient-leds

More Light out, than electricity you put in....  :smiley-eek-blue:

Going by the date, it's an old article, there has to be some news about their latest developments...

JimboZA

Wow.... light up the room and cool it down at the same time!
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fungus

I bet people still won't use resistors with them...
No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

tack

Can we all look forward to brightly lit, led-lined fridges and freezers. :-)

Krupski

Gentlemen may prefer Blondes, but Real Men prefer Redheads!

MarkT

This is the LED as heatpump - or "light-emitting fridge" (!)

Basically turning heat into light increases entropy, so its thermodynamically favorable, in a pn-junction the electron flow
is coupled to this heat->light conversion and thus it is current-controlled.

Compare to a peltier device...
[ I won't respond to messages, use the forum please ]

JimboZA


Basically turning heat into light increases entropy, so its thermodynamically favorable


Aaaaargh..... the E-word.... Now I remember why I hated undergrad thermo classes
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jaredpi

Wow! Does anyone know if, when, or where you can get these?

mauried

What would you do with one.
Produces 69 picowatts of light.
Not much you can do with that, let alone see that it was on.

jaredpi

Quote
What would you do with one.
Produces 69 picowatts of light.
Not much you can do with that, let alone see that it was on.

Because of this possibility :):
Quote
Going by the date, it's an old article, there has to be some news about their latest developments...

vasquo

Something is not right...

LEDs light output are measured in lumens...

Kinda odd the scientists used "watts" to measure the light output. What gives?

JimboZA

Quote
Kinda odd the scientists used "watts" to measure the light output


Well light is energy (Joules) in its own right and the rate at which energy is produced or consumed is power (Joules / second = Watts).

Quote
Produces 69 picowatts of light....Not much you can do with that


Yeah, you'll need a shed load of the things to be able to read the newspaper, let alone keep the drinks cold.....
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vasquo

Well, a toaster can consume 150watts of energy so I guess the glow from it's heating coils is 150 watts of light output also.

You know what I mean? 


winner10920

lumens isnt a very good measure of output since it is a measure of how human eyes can see it, so something that small would probably be less than a lumen, but for example look at infrared leds, they are measured in the same way since you cant see the infrared so technicaly you can have a 10W infrared-led and feel the heat a foot away and yet it will be outputting <1lumen

JimboZA

Arduino ethernet server here.... http://jimboza.gotdns.com:8085/

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