Recent content by pretmetled

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    230% Efficient LEDs

    Curious indeed.... this post was transported 4 years in the past and is now a pro-actove reply to the OP before the OP even thought about P-ing his OP. O_o ... If you mean the post right above in this thread, then yes I read it since it's right above in this thread. Which is what the hot...
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    230% Efficient LEDs

    I'm 230% sure I don't quite understand that question. Sure. I'll take your "some electrical energy" to mean a 9 Volt battery stolen from a passing energizer bunny. I will further take your "some heat" to mean a big stick of iron that has been conveniently heated to say 1500 Kelvin. Now during...
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    230% Efficient LEDs

    Random google hit du jour: http://www.cree.com/products/pdf/XLampXT-E_ROY.pdf Page 6, radiant flux specified in mW. As far as I'm concerned the penchant for using lumens has everything to do with convention in a particular business (lighting) and nothing with it's merit over SI base units (as...
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    230% Efficient LEDs

    Wut? I guess that all those laser output specifications in Watt are meaningless then. :P Translation: measuring light output (you know, photons schmotons) in Watt is perfectly valid.
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    230% Efficient LEDs

    Yeah, ran into that article earlier on. Nice heat pump. :P
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    Osram Duris E3 PLCC LEDs

    Amusingly enough also while buying parts at Mouser I ran into these leds. Since I couldn't find them previously mentioned on the forum thought I'd post it here. Ordered some for testing to see about that 85 CRI...
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    The details of LED technology?

    Mmmmh? I would think a led that does 200 lumens/watt of WHITE light is ever so slightly more than 20% efficient. I don't know how you arrived at that 20% BTW. For the sake of a simple example, lets assume that this 200 lumens/Watt led was a purely green led bang on target on the 555 nm line. In...
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    New LED manufacturer in Silicon Valley

    Random article: http://www.nytimes.com/2012/02/21/science/engineers-take-aim-at-efficiency-barrier-in-led-technology.html The bit about Auger recombination is interesting.
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    Already know this LED from Nichia already?

    In my naivety I went looking for the blue led tech from Nichia these white leds are riding on. The thought process went a little like this: "Wow, efficient white leds at a low price. These must be based on some blue leds with phosphor slapped on. So no doubt Nichia is also selling these highly...
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    MCPCB vs regular boring old double layer with thermal via's

    At the very least it was amusing to read. I like that guy's brand of realistic pessimism. XD
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    Already know this LED from Nichia already?

    Or heaven forfend, when some infidel puts them on a regular PCB riddles with via's slapped on a heatsink. Nichia just might have a perfectly legit business related reason for the lack of slug. Such as "it's good enough, and without slug it's even cheaper". After all, it's only a mere 1340 mW per...
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    German LED Cloud Ceiling

    The trapped heat + light loss is indeed an unfortunate side effect of the diffuser. But a straight up HD display on the ceiling might not work so great as office lighting. XD I mean what with all the ceiling staring no work would ever get done!
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    Already know this LED from Nichia already?

    Bam certainly sounds about right. BAM! to my wallet :P I guess for now I'll just have to make do with a mere 78% nitrogen content. Other than that, nice unit. :)
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    German LED Cloud Ceiling

    Looking for old RGBW walls I had not really considered. I'll keep an eye out on that from now for opportunities. That particular one you linked to looks to be a bit too high density for my needs, but the idea is a sound one! So here's hoping someone needs to get rid of low-density...
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    MCPCB vs regular boring old double layer with thermal via's

    Actually that appnote turned out to be pretty useful. As you say nothing groundbreaking, but just a slightly different angle on things which helps add to the big picture. And the book tip was useful too! Based on the author's name I found this here link which has all sorts of fun stuff on the...
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