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Laser pointer power requirements?

M

Mark Healey

Jan 1, 1970
0
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.
 
R

Randy Day

Jan 1, 1970
0
Mark said:
Does anyone know what kind of current a 4.5 volt laser pointer needs to
draw?

I suspect it depends on the model you choose.
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.

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.
 
R

redbelly

Jan 1, 1970
0
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.

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
 
M

Meat Plow

Jan 1, 1970
0
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.

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.
 
M

Mark Healey

Jan 1, 1970
0
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.

We're not an attractive target for ambulance chasers. The money just
isn't there.
You will have to search aisle by aisle,
but you are already doing that anyway.

That's exactly what I want to stop doing.
 
P

Phil Allison

Jan 1, 1970
0
"Mark Healey"

We're not an attractive target for ambulance chasers. The money just
isn't there.


** 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
 
H

Homer J Simpson

Jan 1, 1970
0
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.

You could motorize them and make them return to home base after 15 minutes
:)
 
M

MassiveProng

Jan 1, 1970
0
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.


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.
 
M

MassiveProng

Jan 1, 1970
0
We're not an attractive target for ambulance chasers. The money just
isn't there.


That's exactly what I want to stop doing.


Hahahahaha... RFID!
 
M

MassiveProng

Jan 1, 1970
0
Go sniff some solder.


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

It is your worst attribute, you stupid ****.
 
R

Randy Day

Jan 1, 1970
0
Mark Healey wrote:

[snip]
We're not an attractive target for ambulance chasers. The money just
isn't there.

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.
 
M

MassiveProng

Jan 1, 1970
0
Read above.

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!
 
M

MassiveProng

Jan 1, 1970
0
You do not have my permission to reply to my poasts.

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!
 
M

Mark Healey

Jan 1, 1970
0
"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.

Wow, another one for the kill file.
 
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