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What power strobe to be seen in daylight

Discussion in 'Lighting' started by mozzey, Mar 14, 2009.

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  1. mozzey

    mozzey Guest

    Can anyone here in s.e.l. please advise me.

    I want a large warning light to come on inside my house when a car
    drives up and triggers my pathway alarm. I can't have an acoustic

    At first I used a floodlight with a 500W halogen bulb.

    Unfortunately, it wasn't very noticeable in bright daylight. So I went
    and bought this 20W mini strobe but it's far, far too weak to be seen
    easily. (I'm in the UK where daylight is not often dazzlingly

    So I figure a more powerful strobe. What sort of power would it have
    to be for it to be mounted in an interior hallway and flashing light
    be noticed in one of the (smallish) side rooms?

    I don't expect anyone to be facing the strobe head when it goes off so
    they wouldn't be able to observe it when it flashes.
  2. In <>,
    Those probably work fine through common indoor artificial lighting
    levels of schools, hospitals, offices and retail spaces - up to 2,000 or
    2500 lux or so, my guess.

    But if one is going to work in direct sunlight and want a strobe to be
    visible, there are 2 solutions:

    1. Add strobes so that at least one strobe is forward or diagonally
    forward of one's face for all common working positions. Some of these
    strobes may be "slave flashes" available from photo equipment shops.

    2. Get some big monster of a strobe having energy level around or over
    500 watt-seconds (joules) and a "slave flash" mode, and deploy it and one
    of the "fire alarm strobes" in a manner such that the big monster is
    triggered by one of the "fire alarm" ones.

    The "Big Monster" should be one picked out from testing at a suitable
    photo equipment shop. Bring a "fire alarm" strobe to the shop and see
    what big ones have slave flash mode and ability to flash at full or a
    fairly high flash energy setting with flash rate of your fire alarm

    A Photogenic "Powerlight 1500SL" "monolight" (or whatever supersedes
    that) at 1/2 or 1/4 of "full blast" has a good chance of flashing that
    frequently with flash energy level describable by 125-250 watt-seconds.
    With a suitable reflector, that is probably fairly easy to notice in a
    home area with sunlight coming in.

    A "monolight" is a unit not requiring a separate "power pack". The term
    "monolight" is used mainly/only for things big enough for a "separate
    power pack" to be a "design option".

    If something like a Photogenic "Powerlight 1500SL" is not big enough,
    then the next major step up is Speedotron "Black Line" or anything similar
    by competitors. That sounds to me like a couple kilobucks for a strobe.
    And I do not actually know that "slave flash" is available - but when the
    budget gets that big, I expect it to be easy to come up with a way to
    trigger it for use as an "alarm strobe", fair chance with an oscillator of
    a kind that can be made with a 555, a comparator, an op-amp, a
    Schmidt-trigger inverter, or 2 transistors.

    - Don Klipstein ()
  3. Mike

    Mike Guest

    Buy something that isn't mickey mouse from RS




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