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Cree announce 200L/W led production

Discussion in 'Electronic Design' started by Martin Brown, Dec 30, 2012.

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  1. Martin Brown

    Martin Brown Guest

    This is really very impressive with the same luminous efficacy as large
    scale Low Pressure Sodium SOX lighting and at 1W / 25C too.

    I suspect the very early adopters of "low power" LED lighting are going
    to get their fingers burned. This new generation really will be truly
    lower power LED lighting unlike the stuff being deployed now at 50L/W.
    The big question is how long will the kit live in service?

    Capacitors in switched mode PSUs still seem to die far too often :(
  2. Guest

    If you are referring to CREE MK-R LEDs
    Light output Up to 1769 lm @ 15 W, 85°C

    = 118 lm/W

    Still below (ugly) LP sodium lamps.
  3. Artemus

    Artemus Guest

    The marketing guys are doing what they always do. The phrase "up to"
    just puts an upper bound, no matter how absurd, on something. The real
    weasels use "up to" followed by "or more".
  4. Guest

    It's more general than that. Brits consider a corporation to be
    plural, where Americans consider it to be singular. I guess the
    Europeans consider it to be a group of people (even though it may not
    be), rather than an entity unto itself. Perhaps if we did the same,
    there wouldn't be so many nuts around who want to "strip personhood"
    from corporations.
  5. Guest

    With my DSL line it's about "half of theoretical". There is no
    "occasionally" about it.
  6. Martin Brown

    Martin Brown Guest

    It isn't that clear cut at all. British English doesn't obsess about the
    singularity or plurality of a corporate business entity. Both forms are
    in common usage here. Google for "ICI announce" and "ICI announces"
    finds a slight preference in the English speaking news media for the
    USian style even in UK papers. Perhaps to avoid confusing Americans...

    That is from 1966 and is ICI Announces (But then their full name
    Imperial Chemical Industries was a clearly plural form). Other less
    obviously pluralistic UK companies have a more even split.

    Most companies with names ending "s" get treated as plural over here.
  7. Martin Brown

    Martin Brown Guest

    The marketing guys always do that but even so these new LEDs look like
    they are a factor of two better at power to light conversion than the
    units currently being deployed by certain UK councils to "save energy".
    You are being fleeced. DSL speeds should be roughly speaking at least
    half of what the theoretical line speed at your distance from the
    exchange can support - assuming that you have a decent ISP. Throughput
    when there is low contention should be roughly about 80% of sync rate.
    Various calculators exist to compute attentuation to expected DSL rate.

    Having long cables runs up on poles flapping in the breeze doesn't help.

    Once the thing has trained it should deliver more or less steady
    performance with some diurnal variation as MW interference comes and
    goes with nightfall.

    Crude rules of thumb but they should hold in most places. All bets are
    off if you select a particularly bad ISP with massive contention ratios
    and inadequate bandwidth external connections to the net.
    That is cheeky. 1.00x would be acceptable. 0.85x could leave them open
    to return of goods in the UK as not fit for purpose.
  8. Fred Abse

    Fred Abse Guest

    I think it's down to "journalistic house style".

    Legally, a corporation is a single person, in most jurisdictions.
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