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Laser pointer power requirements?

Discussion in 'Electronic Basics' started by Mark Healey, Mar 10, 2007.

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  1. Mark Healey

    Mark Healey Guest

    Does anyone know what kind of current a 4.5 volt laser pointer needs to
    draw?

    It's for a somewhat stupid project. Where I work we have 5 library stools
    that are never where you need them and can be difficult to find in the
    stacks. I'd like to rig up a laser pointer to point at the ceiling and
    power it with some solar cells.
     
  2. Randy Day

    Randy Day Guest

    I suspect it depends on the model you choose.
    One problem: all it takes is one litigation-minded
    patron to bend over the stool, look down into the
    light (deliberately or not) and cry "Retinal
    damage! Lawsuit!".

    If you chose a pointer that warns "don't look into
    the beam" (try finding one that doesn't), you're
    sunk.

    You might be better off with an LED flashlight in a
    tube to direct the light upwards. It's still harsh
    to look into, but not damaging.
     
  3. redbelly

    redbelly Guest

    I'll echo Randy's sentiment that having a laser on continuously,
    directed upward from near floor level, in a public place is a BAD
    idea. Even if nobody damages there eyes, there is a tripping hazard
    if somebody catches the beam in their eye while stepping on or off the
    stool.

    As an alternative, I'll suggest that you get some reflective tape from
    a home center or hardware store, and wrap a strip around the stool.
    Get a small flashlight, and then you'll be able to spot a stool along
    a long aisle pretty easily. You will have to search aisle by aisle,
    but you are already doing that anyway. The reflective tape and
    flashlight will help you spot them more quickly.

    Regards,

    Mark
     
  4. Meat Plow

    Meat Plow Guest

    A 670/650 nm diode can put out no more than 5 mW in the US and 1 mW in
    Europe. Knowing that you do the math.
     
  5. Mark Healey

    Mark Healey Guest

    We're not an attractive target for ambulance chasers. The money just
    isn't there.
    That's exactly what I want to stop doing.
     
  6. Phil Allison

    Phil Allison Guest

    "Mark Healey"


    ** You are nothing short of a total, fucking ass - Mark.

    Injured people can sue an organization or any person or persons involved in
    the events that led to their injury *personally* for whatever assets those
    persons may have.

    Take the good advice you have been given and stop being a brainless little
    shit.




    ....... Phil
     
  7. You could motorize them and make them return to home base after 15 minutes
    :)
     
  8. MassiveProng

    MassiveProng Guest


    Their drive circuits do not all have the same efficiency.

    Regardless of what is allowed to be emitted, the drive elements for
    them differ vastly.
     
  9. MassiveProng

    MassiveProng Guest


    Hahahahaha... RFID!
     
  10. MassiveProng

    MassiveProng Guest


    Lo Jack!
     
  11. Meat Plow

    Meat Plow Guest

    Go sniff some solder.
     
  12. MassiveProng

    MassiveProng Guest


    Leave it to a Usenet KookTard to always snip anything that might
    **** with his little kooktard world.

    It is your worst attribute, you stupid ****.
     
  13. Randy Day

    Randy Day Guest

    Mark Healey wrote:

    [snip]
    You may not think so, but in the situation
    you're describing, they can go after the
    organisation, *you* (as the one who designed
    the hazard), the day-to-day people in the
    organisation who allowed the hazard to
    remain in the building, etc. etc.

    Some might do it 'just to prove a point',
    or 'to protect the other patrons', not
    because they expect to get rich.

    The hi-brite LED in a tube will also project
    a larger spot on the ceiling, which will not
    disappear into every nook and cranny in the
    ceiling like a tiny red dot will.

    Please consider a non-laser alternative.
     
  14. Meat Plow

    Meat Plow Guest

    Read above.
     
  15. MassiveProng

    MassiveProng Guest

    As suspected. You starred in the film Total Retard.

    Your bullshit doesn't work, wussy boy. The record is there for all
    the world to see, because no matter how much of a sniptard you are,
    the original posts remain.

    Your sniptard baby bullshit only affirms how fucking wrong you were.

    The power limits you mentioned are for OUTPUT, NOT consumption,
    dipshit.

    Face it, you were and are 100% wrong (as usual) for giving industry
    output limits when input consumption is clearly the requisite.

    So the SLAP is upon you, dumbfuck!

    BWuahahahahahahahahahah!
     
  16. Meat Plow

    Meat Plow Guest

    You do not have my permission to reply to my poasts.
     
  17. MassiveProng

    MassiveProng Guest

    Bwuahahahahahah!


    As evidenced by ANY simple google groups look up, your demand that I
    do not, nor your retarded declaration that I cannot are proven utter
    bullshit every time.

    Does it really bug you that you cannot stop me?

    I hope so. You are pathetic, and if I wanted to follow around your
    every fucking post I could, and there is not a goddamned thing you can
    do about it, KookTARD! Except, of course, your current 100% immature
    baby bullshit method of retreating from the fact that you are full of
    shit... again!
     
  18. Meat Plow

    Meat Plow Guest

    See, I have total control over you.
     
  19. Mark Healey

    Mark Healey Guest

    Wow, I haven't needed to kill file anyone in a long time.
     
  20. Mark Healey

    Mark Healey Guest

    Wow, another one for the kill file.
     
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