Who's doing a NYE show?

[mccarrot]

Thats a pretty bold statement there! We have found people don't really care here whether the show is above head or in peoples faces.

I do not agree, laser can make the impression to the audiance to be in another world. this effect is way way better if the beams are all arround you instead of only above your head.

At home I cannot do audiance scanning because of the limited distance, but when I take my laser to a bigger venue where I can do audiance scanning the impact is 1000x better.

For exemple if you make a tunnel with you laser, when do you think the tunnel looks better, above you head or when you inside of hte tunnel.

At some small party's i don't audiance scan because of the limited distance. every time I do this people come to me and ask why I dont scan in the audiance.
People in the Netherlands just expect audiance scanning, its done everywhere...

The people who dont care is the show is above theai haed probbably have never seen a good audiance scan show.

Here is a nice example:
http://nl.youtube.com/watch?v=eecQ4a...eature=related

[Stuka]

I do not agree, laser can make the impression to the audiance to be in another world. this effect is way way better if the beams are all arround you instead of only above your head.

At home I cannot do audiance scanning because of the limited distance, but when I take my laser to a bigger venue where I can do audiance scanning the impact is 1000x better.

For exemple if you make a tunnel with you laser, when do you think the tunnel looks better, above you head or when you inside of hte tunnel.

At some small party's i don't audiance scan because of the limited distance. every time I do this people come to me and ask why I dont scan in the audiance.
People in the Netherlands just expect audiance scanning, its done everywhere...

The people who dont care is the show is above theai haed probbably have never seen a good audiance scan show.

Here is a nice example:
http://nl.youtube.com/watch?v=eecQ4a...eature=related

Just curious - and hopefully this is taken as a question of techniques you could share with the rest of us on PL. This is an HONEST question, and not meant as a bashing of audience scanning:

When you guys do use audience scanning in your shows, what kind of laser power are you using, and what kind of precautions / techniques / planning do you use to keep the eyesight safe for the folks in the audience?

Cool looking beams, no doubt - but from what I saw in the video, I'm pretty sure I wouldn't want that much laser light directly in my face!!

[keeperx]

look at the beam thickness to start with...

with fog, a 5mw beam is super visible...

thick beams spread the power over a greater area.. now I am no expert but based on what im seeing there.. the closest person that actualy gets scanned is like 100 feet from the galvo.. and the beam is the size of a paper towel tube..

[Stuka]

look at the beam thickness to start with...

with fog, a 5mw beam is super visible...

thick beams spread the power over a greater area.. now I am no expert but based on what im seeing there.. the closest person that actualy gets scanned is like 100 feet from the galvo.. and the beam is the size of a paper towel tube..

Sorry dude, but -
Well - duh!

I've been around lasers in one form or another for many years, and something tells me the beams in that show were a WHOLE lot more than 5mw!! As a person who takes my eyesight VERY seriously, and at the same time enjoys all that lasers have to offer, it would be nice to know what the generally accepted practice is for the folks who are so involved in the "audience scanning or nothing" culture we hear so much about in Europe.

[tocket]

look at the beam thickness to start with...

with fog, a 5mw beam is super visible...

thick beams spread the power over a greater area.. now I am no expert but based on what im seeing there.. the closest person that actualy gets scanned is like 100 feet from the galvo.. and the beam is the size of a paper towel tube..

The divergence is rather high and from what I've seen the beam is about 5 cm before it hits the nearest portion of the audience.

The lasers are very powerful though... typically 5-15W. While a significant portion of that has been scattered before the beam is terminated, it is still quite a lot.

Assuming no scattering losses, a laser power of 10W, 50 mm beam diameter with a homogeneous power profile and 7 mm pupil diameter you get blasted with a mere 0.8W of laser light.

[Stuka]

0.8W direct to the eyes, huh??

Looks cool, no doubt, but -
Ouch!!

[mccarrot]

Just curious - and hopefully this is taken as a question of techniques you could share with the rest of us on PL. This is an HONEST question, and not meant as a bashing of audience scanning:

When you guys do use audience scanning in your shows, what kind of laser power are you using, and what kind of precautions / techniques / planning do you use to keep the eyesight safe for the folks in the audience?

Cool looking beams, no doubt - but from what I saw in the video, I'm pretty sure I wouldn't want that much laser light directly in my face!!

DISTANCE! not power!!!

30mW laser scanned from 5 meter will be dangerous!
10W laser from 100 meter will be safe (if scaned properly and fast moving and no static images etc etc. etc.)

Every meter you get furter away from the laser it will be expontial safer, not only due to divrigence but the beam will also pass your eye much faster.

[keeperx]

i think that the fog playing tricks there.. i could be wrong.. but a show of that scale would (you would think) run a safe show..

[keeperx]

DISTANCE! not power!!!

30mW laser scanned from 5 meter will be dangerous!
10W laser from 100 meter will be safe (if scaned properly and fast moving and no static images etc etc. etc.)

Every meter you get furter away from the laser it will be expontial safer, not only due to divrigence but the beam will also pass your eye much faster.

if thats the case.. then its not safe... relying on the speed of the beam is not a good idea...

[mccarrot]

Not the scanrate but the speed you move the image over the audiance.

There are many many factors, but distance got the most effect on those factors.

I tried to understand the MPE calculations but this is hard to use in real life. After I talked to Hugo about this topic and attended many of his shows I finnaly start to understand the mistery of audiance scanning.

But discussing audiance scanning is always a hard topic on this forum (kinda like discussing the GUN privaliges in the USA )

Please let try to discuss this in a normal way and don't start bashing audiance scanning