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Halogen lights and high output alternators

Discussion in 'Boat Electronics' started by Glenn Ashmore, Mar 31, 2005.

  1. I have heard that 12V halogen bulbs do not last long running at absorption
    charge voltages. A couple of smart regulators (Ample Power being one) have
    a halogen lighting feature that limits alternator output voltages. I picked
    up a couple of 40 amp DC/DC converters on eBay and was planning to use one
    to power the electronics. Would it be worth while to use the other for the
    lighting circuits? Especially the nav lights which are harder to change
    out.

    --
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at: http://www.rutuonline.com
    Shameless Commercial Division: http://www.spade-anchor-us.com
     
  2. Doug Dotson

    Doug Dotson Guest

    I've never heard of any problems at absorption voltages, but most definitely
    at equilization voltages. Almost all the incandescent lights on my boat are
    halogen and not one has burned out in the 6 years I have owned the boat.
    I'm in the process of replacing them all with flourescent.

    Doug
     
  3. Doug Dotson

    Doug Dotson Guest

    How can running hotter be more efficient? I would think for a light bulb,
    the most energy dissipated as heat rather than light, the less efficient it
    would be.

    Doug
     
  4. Terry Spragg

    Terry Spragg Guest

    Forget tungsten.

    White LEDs are now common and cheap and 5 times as efficient as
    incandescent, and will get better quickly. Vehicles are all going to
    LEDs soon, prick these words well, Lothario.

    Last week at the dollar store, I got a white LED with 2 - 3volt
    lithium batteries in a plastic squeeze light for my key ring for a
    buck. I don't know about the LED, current / life specs wise.

    It's bright, it's white, it's compact and cool. I don't know how
    long it will last, but it's a beaut!

    I'm gonna make a 6 v pocket flash with a dimmer out of a cigar tube
    after the lithiums cells die, just for fun.

    My mini-flourescent 100Watt equivalent replacement lamp touted for
    long life died in my bathroom yesterday, after about a year of
    ordinary use.

    Rip-off!

    Terry K
     
  5. Sure, these things are cheap but try making a masthead tri-colour out of
    LEDs. Current price is something like $300US compared to $6 for a halogen
    version.

    Regulating the voltage going up the mastehead sounds like a good idea.
    Since this does not involve that much current, certainly not 40 amps, I
    wonder if you could build a small voltage stabilizer using a 7812 regulator
    IC for just the mast lighting circuit?
     
  6. Doug Dotson

    Doug Dotson Guest

    Doesn;t less in the IR region equate to cooler running?
     
  7. Doug Dotson

    Doug Dotson Guest

    There are plenty of low-dropout regulators that only need a tenth of a volt
    or so differential.
    That would be either boost-buck converter or a buck-boost converter. I
    like the boost-buck (Cuk) personally.
    Quite a few more compoonents. But keeping the switching noise out of your
    radios is a headach for such a simple application.
     
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