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Flickering Light

Discussion in 'Electronic Basics' started by don, May 6, 2010.

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  1. don

    don Guest

    I have a Luxo asymmetrical task light which takes an 18 watt bulb, which is
    starting to give me trouble. Most of the time it will just flicker as if it
    is trying to come on, but sometimes it will flicker once or twice and then
    come right on. When it does come on it shines bright. Luxo will not support
    this task light anymore because they say it is too old??? even though it
    was supposedly guaranteed for life. What is causing this intermittant
    problem and how could I fix it? I hate to throw the light out because it
    was around $200 when I bought it and it does work fine after it lights up.
  2. don

    don Guest

    You thought that was YOUR life time? What does the bulb itself look
    like? Was it a custom item for Luxo or is it available elsewhere? Is
    it a CCFL? Is there a link to where we can see it?

    Thanks for yor reply..... I took the light apart and found the ballast to be
    made by B and L Technologies

    Interesting it says that if the bulb goes bad the ballast will stop
    working..... but I see a brwon spot on the ballast so maybe it is bad also.

    The label on my ballast says: Flourescent Lamp Ballast 163304 High Power
    Factor Instant Start Class P Type 1 outdoor Input 120v

    Max 0.13A NU6 _ 1128 _NT _1
  3. don

    don Guest

    So the bulb is an 18W Sylvania Dulux D compact flouresecent 20677 835
    but when I go on to look at the specs the website is off
    Even though this website is on the bulb box????? I'm trying to figure out
    if this bulb has an EOL end of life protection mode which is what the
    ballast manuf. recommends
    to protect the ballast.
  4. This does remind me of a recent story in Usenet where someone was trying
    to fix a some-somewhat-similar lighting unit having an 18 watt compact
    fluorescent bulb, and achieved the fix by replacing the "starter" with the
    guts of a FS-4 "fluorescent lamp starter", despite the wattage and the
    voltage drop of the "starterless ballast-less CFL" that I am most
    familiar with being more suitable for using the guts of a FS-2 "starter".

    One thing that everybody should keep in mind for fluorescent fixtures
    that need "starters" that are separate from ballasts: Bad "bulbs"/"lamps"
    are hard on starters, and bad starters are hard on "bulbs/lamps/tubes".
    This probably explains sonmewhat-common advice to replace the starter
    when replacing the "bulb".

    - Don Klipstein ()
  5. "Instant Start" makes me think of 1 of 2 related technologies where the
    ballast does the starting without the "starter" that I mentioned

    I would best-guess that the "bulb" (lamp) is bad, or the ballast is bad,
    or either maybe both of those were sourced profitably from low-bid
    suppliers that I suspect could be in or near southeast Asia.

    In such a case, I am starting to get into a better mood to "cut the
    losses", as in either replacing the lighting unit or hacking into it
    both a better ballast and a better "bulb"/lamp, even if that requires
    hacking in a socket from some other cheap fixture or from one in a
    dumpster on the curbside for trash pickup.

    Best Regards,
  6. Not that I made actual effort to research this, but I wonder if "Dulux D"
    was some "mere fad" or similar to GE's "2D".

    Another thing to consider - Sylvania is now part of Osram. Should what
    you need be more of a European item, I give some chance that can
    get you such a thing, especially if Philips offers such a thing, even if
    only into the "European Market". Maybe do their "Ask Dr. Bulb" thing,
    that may work, since I was a former "Dr. Bulb" at (I might get
    into a mood to do so again soon, in times when more people need to "scare
    up work".)

    But besides that, one bit of advice that I often offered back when I
    was "a Dr. Bulb" at, and which I stand by even now, is to:

    When purchasing lighting units, consider and make-the-motions for
    getting replacement "bulbs" (lamps). One would probably prefer to
    purchase lighting units that can be "relamped" (have the "bulb" replaced)
    by something of an "industry standard type" available from at least 2 of
    the "Big 3" (Philips, Osram/Sylvania, and GE).

    (As for how a "bulb" becomes a "lamp": Generally in North America to
    "technical types" outside the automotive industry, "the bulb is the glass
    part of the lamp". And the lamp is what gets inserted/screwed into a
    socket / "lampholder" or light-fixture, better known to "lighting
    engineers" at least in North America and at least in optical sense as a

    - Don Klipstein ()
  7. In <>,
    So "Dulux D" means "doubletwintube" AKA "quadtube"?

    That site that you mentioned gives me pictures of "bulbs". If those
    pictures reasemble what you have, then I think you are on a good track.

    - Don Klipstein ()
  8. don

    don Guest

    Thanks for all this information.......... I"m looking at the ballast and it
    has a brown spot on it and so does the bottom of the bulb.....
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