Old 11-19-2015, 02:15 PM #1
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Default Too cheap to be true? 5w Blue laser 450nm

Hello, Im pretty new to this community and also to lasers in general
I know the basics of nm and the brightness according to human eye color sensitivity and the basics parts of lasers.
Although Im not sure how the caculation works 1A 2A and how they
are connected to watt and voltage and so on.
I am searching for powerful laser for my concert lighting DIY project.
Its nothing big but after doing few days of googling, I figured out that in really cant afford high output green lasers since its too expensive.
So, despite sacrificing the visibility, I turned to the more Thick Beam that comes out of blue lasers.
I think I could build 2w 450nm blue laser for pretty cheap for under $80 or so.
getting separate parts from ebay (2w m140 drivers)
But this item popped up?

5W 445nm Blue Light Laser Pointer Pen Military Power Beam Cigarette Burn Match | eBay

What the?
Its focusable and also has 5w output with lot of people purchasing it? for only 60 dollars?
https://www.youtube.com/watch?v=53GJJHwQ8BA
This guy's laser looks pretty high quality and powerful (maybe some smoke or camera sensitivity)
When I went into his site where he bought the diodes, 6w laser diode and drivers were $160
Isnt that supposed to be a normal price?
Im very confused..

Maybe the one on the ebay has poor heat sink and all of that kind of accessories but even if that's true its too cheap.?!?
any other disadvantages? besides these?
I'm thinking of modding the Ebay one with other parts...

Any thoughts on this item?
Thanks in advance


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Old 11-19-2015, 03:40 PM #2
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Default Re: Too cheap to be true? 5w Blue laser 450nm

Tats nothing i purchased a 10W From Ebay for only $7.99, Well when it arrived it was only 73mW, And alibaba got already 100W lasers, Well yes i did try modding the same laser your trying to get and at the end i discard it because the parts are all glued inside the housing i try pushing it out hammering it out but i damaged the housing, If your lucky and purchase one and its less glued on screwed in the yes its amazing to mode it
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Last edited by Alien Laser; 11-19-2015 at 03:45 PM.
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Old 11-19-2015, 03:51 PM #3
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Default Re: Too cheap to be true? 5w Blue laser 450nm

Quote:
I am searching for powerful laser for my concert lighting DIY project.
Could you provide some more detail on this part?
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405nm | Banggood LT-850 | 50mW Metered | Review Unit | >>Review<<
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1.6W Metered | Review Unit | >>Review<<
473nm | B&W Tek BWB-10-OEM |
488nm | Spectra Physics 163 Argon | ~30mW Metered |
495nm | Laser66 Pen Build | WIP
515nm | PL515 Pen Build | 50mW | >>Build Thread<<
520nm | Laserlands 520 5mW | 3mW Metered | Review Unit | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered |
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2


B&W Tek Spectrometer
LaserBee 2.5W USB LPM


Check out my Reddit Subreddit! >>/r/laserpointers<<

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Old 11-19-2015, 04:27 PM #4
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Default Re: Too cheap to be true? 5w Blue laser 450nm

Wholesale 5w Blue Laser Pointers 5000mw Burn - Buy Cheap 5w Blue Laser Pointers 5000mw Burn from Chinese Wholesalers | DHgate.com
WOW there are some weird and unrealistic pricing on this site....
maybe they are confusing mw with w which to me sounds pretty dumb...
look at this item too..

Laser Pointer Presentation Super Most Strong 532nm Green Laser Pointer 5000mw 5w Burn Black Matches/Pop Balloon/Light Green Laser Pointer Buy From Credible1026, $36.65| Dhgate.Com
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Old 11-19-2015, 04:35 PM #5
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Default Re: Too cheap to be true? 5w Blue laser 450nm

They probably rated the input power rather than the output power. a pump diode at 300mW would probably use 1W including driver losses. Add the MCA conversions, and you'll get around 50, so my wild guess is 50-100mW.
someone posted this regarding dhgate

https://www.youtube.com/watch?v=WBADA1Cqbl8
also the video

Buy Green Laser Pointer 2015 Newest Green Laser Pointer 20000mw 20w Adjustable Burn Black Match With Charger And Laser Heads,Bright Laser Pointer From Goodlucky2013, $25.14| Dhgate.Com
yep theyre fake!
SPREAD THE WORD!
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Old 11-19-2015, 04:40 PM #6
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Default Re: Too cheap to be true? 5w Blue laser 450nm

Quote:
Originally Posted by snrnsi4321 View Post
They probably rated the input power rather than the output power. a pump diode at 300mW would probably use 1W including driver losses. Add the MCA conversions, and you'll get around 50, so my wild guess is 50-100mW.
someone posted this regarding dhgate

https://www.youtube.com/watch?v=WBADA1Cqbl8
also the video

Buy Green Laser Pointer 2015 Newest Green Laser Pointer 20000mw 20w Adjustable Burn Black Match With Charger And Laser Heads,Bright Laser Pointer From Goodlucky2013, $25.14| Dhgate.Com
yep theyre fake!
SPREAD THE WORD!
Or they just made up a number to sell cheap junk to people that don't know any better? That seems like a more reasonable explanation.

We know they're fake. It's not some new revelation.

Also, you should avoid double posting - you can use the edit button to update your previous post.
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405nm | Banggood LT-850 | 50mW Metered | Review Unit | >>Review<<
445nm | Sanwu Laser Pocket Series | 400mW Metered
445nm | NDB7242E Pen Build | 60mW Metered | >>Build Thread<<
450nm | LaserPointerStore - Thor H2 | 1.6W Metered | Review Unit | >>Review<<
473nm | B&W Tek BWB-10-OEM |
488nm | Spectra Physics 163 Argon | ~30mW Metered |
495nm | Laser66 Pen Build | WIP
515nm | PL515 Pen Build | 50mW | >>Build Thread<<
520nm | Laserlands 520 5mW | 3mW Metered | Review Unit | >>Review<<
532nm | Gearbest 303 Pointer | 50mW Metered
532nm | Gearbest JD-850 Pointer | 30mW Metered |
633nm | HeNe | 6mW
633nm | Spectra Physics 155 HeNe | <1mW >>Thread<<
650nm | Sanwu Laser Pocket Series | 200mW Metered
808nm | Melles Griot 532nm Lab Unit | No Crystals >10W | X2


B&W Tek Spectrometer
LaserBee 2.5W USB LPM


Check out my Reddit Subreddit! >>/r/laserpointers<<


Last edited by diachi; 11-19-2015 at 04:41 PM.
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