Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Safety & Legal Issues



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 02-11-2011, 02:27 PM #1
Junior Member
 
Join Date: Feb 2011
Posts: 15
Rep Power: 0
kivig is on a distinguished road
kivig kivig is offline
Junior Member
 
Join Date: Feb 2011
Posts: 15
Rep Power: 0
kivig is on a distinguished road
Default Max no protection power?

Hi,
I'm going to build a "better" (original was intended as is) version of this:
Video

And I 'm trying to find a safe answer about what power 405nm laser can be that will be safe for viewers without any protection.
Of course, no one will be let to look into the laser (it will be unreachable), but are there limits on looking at spot lit by it?

Thanks!


kivig is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 02-11-2011, 10:40 PM #2
Banned
 
Join Date: Dec 2010
Location: Illinois
Posts: 76
Rep Power: 0
Sparkles is infamous around these partsSparkles is infamous around these parts
Sparkles Sparkles is offline
Banned
 
Join Date: Dec 2010
Location: Illinois
Posts: 76
Rep Power: 0
Sparkles is infamous around these partsSparkles is infamous around these parts
Default Re: Max no protection power?

Quote:
Originally Posted by kivig View Post
Hi,
I'm going to build a "better" (original was intended as is) version of this:
Video

And I 'm trying to find a safe answer about what power 405nm laser can be that will be safe for viewers without any protection.
Of course, no one will be let to look into the laser (it will be unreachable), but are there limits on looking at spot lit by it?

Thanks!
It depends on the laser wavelength, surface reflectivity characteristics, and distance / (angle of beam) from the surface the people will be located. We would need a lot of info before giving a good answer. 50 mw green (532nm) is super bright for me on a surface and gives me a little bit of an after image at 10 ft. away.
Sparkles is offline   Reply With Quote
Old 02-11-2011, 10:54 PM #3
Junior Member
 
Join Date: Feb 2011
Posts: 15
Rep Power: 0
kivig is on a distinguished road
kivig kivig is offline
Junior Member
 
Join Date: Feb 2011
Posts: 15
Rep Power: 0
kivig is on a distinguished road
Default Re: Max no protection power?

Quote:
Originally Posted by Sparkles View Post
It depends on the laser wavelength, surface reflectivity characteristics, and distance / (angle of beam) from the surface the people will be located. We would need a lot of info before giving a good answer. 50 mw green (532nm) is super bright for me on a surface and gives me a little bit of an after image at 10 ft. away.
Surface is a glossy PVC plastic with reflectance ratio of about white.
The beam is almost perpendicular to surface about 10m away.
People can be anywhere in between or behind laser, but the laser will be above the head level as will the receiving screen so no one should get direct or glossy reflected light.
Environment is very dark. About night in the wood dark.
kivig is offline   Reply With Quote
Old 02-11-2011, 10:57 PM #4
Coherent Light's Avatar
Class 3R Laser
 
Join Date: Jul 2010
Location: Hill Country, TX
Posts: 2,185
Rep Power: 51
Coherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond repute
Coherent Light Coherent Light is offline
Class 3R Laser
Coherent Light's Avatar
 
Join Date: Jul 2010
Location: Hill Country, TX
Posts: 2,185
Rep Power: 51
Coherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond reputeCoherent Light has a reputation beyond repute
Default Re: Max no protection power?

This <5mW
__________________
Coherent::

Last edited by Coherent Light; 02-11-2011 at 11:20 PM. Reason: wrong symbol
Coherent Light is offline   Reply With Quote
Old 02-11-2011, 11:00 PM #5
Prototype's Avatar
Class 3B Laser
 
Join Date: Jun 2009
Posts: 2,712
Rep Power: 107
Prototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond repute
Prototype Prototype is offline
Class 3B Laser
Prototype's Avatar
 
Join Date: Jun 2009
Posts: 2,712
Rep Power: 107
Prototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond reputePrototype has a reputation beyond repute
Default Re: Max no protection power?

It is strongly recommended to use safety goggles for anything >5mW.
__________________
Quote:
Originally Posted by MoonShad0w
No, bird, do not bite my F7 key off
Prototype is offline   Reply With Quote
Old 02-11-2011, 11:13 PM #6
Junior Member
 
Join Date: Feb 2011
Posts: 15
Rep Power: 0
kivig is on a distinguished road
kivig kivig is offline
Junior Member
 
Join Date: Feb 2011
Posts: 15
Rep Power: 0
kivig is on a distinguished road
Default Re: Max no protection power?

Quote:
Originally Posted by Prototype View Post
It is strongly recommended to use safety goggles for anything >5mW.
Is it for protection against getting accidental beam in the eyes or for looking at projected spot?
It's just that in linked video I use about 5-20mw and there's no really noticeable "after-image".
kivig is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 09:34 AM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC