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Philips EcoBoost Halogen Lamps

Discussion in 'Lighting' started by Paul M. Eldridge, Jul 20, 2006.

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  1. I haven't cut open a Philips lamp yet, but if you look at some of the Osram
    samples they don't seem to use a traditional tranformer. Seems to be more
    like the switching unit you get in a dimmer switch which just chops up the
    line voltage to limit lamp power. This sort of circuit is perhaps cheaper
    and smaller than using a full electronic tranformer. Perhaps it also
    explains why the luminous efficacy of these lamps is quite a bit lower than
    the bare 12V capsules.

    If we consider first that the 12V 20W IR capsule operates at 24lm/W, factor
    in 5% absorption losses due to the second outer glass bulb, and then assume
    a 90% efficiency for the "transformer", it indeed brings us down to a total
    system efficacy of 20.5lm/W.

  2. Are you sure it's not a miniature electronic ballast like the ones in
    compact fluorescent lights? The output is directly to the lamp with no
    low voltage wiring or connectors involved so an electronic ballast is a
    bit simpler than an electronic transformer. If it was a phase angle
    control circuit it would require a significant choke to limit RF
  3. I think we're all hung up here on jargon. But, first to go
    back to James' comment. A line frequency transformer would
    be far too big and heavy compared to an electronic power
    supply of some type.

    Now, on to the jargon. I'm not sure exactly what you mean
    by an electronic transformer, but I was not implying that
    the circuit would have line-to-load isolation or would
    produce a fixed output voltage independent of load.

    A number of switching circuit have been developed that could
    be used to run a 12-volt filament from a 120-volt or
    240-volt power line, and all are simpler than an electronic
    ballasts since they don't need to deal with a negative
    impedance load, high starting voltage or additional
    electrode heating circuits. Some people have proposed a
    simple series capacitor, but that is undesirable for two
    reasons: 1) poor input power factor; and 2) the fact that a
    series capacitor would pass voltage spikes right on to the
    filament, causing it to burn out.

    Vic Roberts
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  4. I doubt it. If these are the same as the prototype retrofit halogen
    lamps that Philips were showing at Light & Build Frankfurt last year,
    they are LV halogen capsules fitted with transformer inside a GLS bulb.
    I'm not sure whether they use infra-red coatings, but it's certainly
    Unless there is another new technology involved, I would be surprised to
    see these lamps achieve a higher efficacy than existing low voltage IR
    halogen capsules. If I remember right, existing capsules manage around

    On the other hand, these are available now (or very soon), and GEs
    product, even if it manages 30 lm/W, isn't :)
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