Old 02-18-2012, 09:22 AM #1
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Default Need help choosing safe lasers for light show project

Hi!
I have wanted to make a light show for a long time.
Right now on my hands, I have a 20mw purple laser module from DX and 2 diffraction gratings from DragonLasers.

Today I saw this video : http://www.youtube.com/watch?v=f4j1ZmQbjoU
(Here is the setup in case you are curious : https://plus.google.com/photos/11659...441?banner=pwa)

I want to make the same thing. She uses a piece of frosted glass, the kind you see used for shower glass panes, but I also plan to use my 2 diffraction gratings with the same laser setup.

For now I only want 2 colors : Purple and red.
20mw for the purple laser is obviously not bright enough once diffracted with the 2 DragonLaser gratings. The dots look too dim for my own taste, so I assume it will also be much too dim if I want to do something like in the video above.
I would also like to add a blue laser later, but blue laser modules seem difficult to find at a good price.

The room in which it will be used is a 12' x 8' room. I plan to project the light on the ceiling but I don't exclude the possibility of using it on the wall where it would be more concentrated. I plan to use it regularly as ambient lighting.

I also want the brightness of each color to be as balanced as possible, of course.

So, what power do you think I shoud get for each laser, red - purple - blue to safely use in a 20' x 8' room if the beams are going to be diffracted?
Thank you!



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Old 02-18-2012, 09:31 PM #2
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Default Re: Need help choosing safe lasers for light show project

Note that if there exists a laser show system with red, green, blue and purple lasers in it that would be safe to use in a room my size, I would go with that.

Though I have googled and haven't found a projector with both 405nm and 445nm lasers in it. I really want the pretty purple laser because of it's color, its blacklight effect and because it will look great when projected on phosphorescent paint, but I also want the colors to be the best as possible if I am to buy a RGB projector and I read here that 445nm is much better than 405nm in that matter...

Last edited by Salmon Pie; 02-19-2012 at 10:04 PM.
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Old 02-18-2012, 10:57 PM #3
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Default Re: Need help choosing safe lasers for light show project

There are many small laser show projectors that are exactly what you are looking for
and for around $200 or less, you need to realy make an effort to look and you will find
them, believe me they are not hiding
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Last edited by Flaminpyro; 02-18-2012 at 11:00 PM.
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Old 02-18-2012, 11:00 PM #4
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Default Re: Need help choosing safe lasers for light show project

But the question is.. what would be safe to use in a room my size? Surely a laser show that outputs a total of 1W isn't recommended in my case.. How high can I go?
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Old 02-18-2012, 11:01 PM #5
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Default Re: Need help choosing safe lasers for light show project

Again start looking, and you will find your not going to get anything near 1watt for $200.00

Have you tried goggling RGB laser projector yet

> http://laughingsquid.com/home-built-...ser-projector/
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The Violet Pip Squeek 45mW

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Last edited by Flaminpyro; 02-18-2012 at 11:04 PM.
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Old 02-19-2012, 07:15 PM #6
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Default Re: Need help choosing safe lasers for light show project

It's difficult to google anything right now, because I don't know what I am looking for because I don't know what power outputs I am looking for.

Yes I have googled RGB laser projector... but as I said, I need to know what power output I am looking for because right now, all I come across in my searches are laser projectors that are over 500mw. I have no clue what is safe for the use I want to make of it. I need to know. Please answer my question?

Last edited by Salmon Pie; 02-19-2012 at 07:29 PM.
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