Strictly speaking of light output, a regular LED produces much more light than a
laser, and a light bulb even more.  Given a specific current, the LED is the
most efficient for simple light output.  Of course, you won't see the beam
nearly as far as with a laser.

Why are you so concerned about scattered light?  Is this a photographic
application, or are you just concerned that your sensors might detect the light
when they are not actually in the intended spot?

Is this a one-off, or for production?  Can you give us a better idea of what you
are doing?  How fast are the targets moving?  How far away will they be (closest
and farthest)?  Will they have lenses, light pipes, or anything else to help
detect the beam?  How many targets are there?  Do they only move at right angles
to the line you are trying to project?

-Adam



Jinx wrote:
> Well, it's a very strong point source with a collimating lens, it's a done
> deal for around NZ$20. As far as efficiency goes, do you get more
> bang for your buck with LEDs or lasers ?

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